How to Sleep During Pregnancy: Positions, Tips, and What Actually Helps

Why Sleep Gets Hard During Pregnancy

Poor sleep during pregnancy is extraordinarily common — studies suggest that up to 78% of pregnant women report significant sleep disturbances, with the first and third trimesters being the worst offenders. The reasons are both hormonal and physical, and they shift as your pregnancy progresses.

In the first trimester, surging progesterone makes you feel drowsy during the day while paradoxically disrupting nighttime sleep. You’re also running to the bathroom constantly as your uterus presses on your bladder — even though it’s still quite small — and nausea doesn’t always follow a polite 9-to-5 schedule. Learn more about what to expect in the first trimester.

The second trimester tends to offer some relief — the nausea often eases, energy improves, and the belly isn’t yet large enough to make positioning impossible. Many pregnant people describe the second trimester as the “sweet spot” for sleep.

By the third trimester, sleep disruption peaks again. Your belly makes it physically difficult to get comfortable, heartburn intensifies, leg cramps strike at 3 a.m., and anxiety about labor and the postpartum period can keep your brain wired well past midnight. Restless leg syndrome (RLS) affects up to 26% of pregnant women and worsens significantly in the third trimester. For a full picture of what’s ahead, see our third trimester guide.

Best Sleep Positions During Pregnancy

Left Side (SOS — Sleep on Side): The Recommended Position

You’ll hear “sleep on your left side” repeated throughout pregnancy, and the advice is well-grounded. Here’s why left-side sleeping is preferred:

Improved circulation: The inferior vena cava — the large vein that returns blood from your lower body to your heart — runs along the right side of your spine. Lying on your left side prevents your uterus from compressing this vessel, keeping circulation to your heart, kidneys, and placenta running efficiently.

Better kidney function: Left-side sleeping promotes better kidney filtration, which helps reduce swelling in your hands, ankles, and feet.

Less liver pressure: The liver sits on the right side of the abdomen. Left-side positioning avoids putting direct pressure on it as your uterus expands.

If you wake up on your right side, don’t panic. An occasional switch to the right side won’t harm you or the baby — the critical thing is avoiding sustained flat-on-your-back sleeping in the second and third trimesters.

Right Side: A Perfectly Acceptable Alternative

Right-side sleeping is not dangerous. While left is preferred for the circulation reasons above, right-side sleeping is comfortable and safe throughout pregnancy. If you’re experiencing significant hip pain from sleeping exclusively on one side, alternating sides throughout the night is fine.

On Your Back: Fine Early On, Then Transition Away

Back sleeping is generally fine in the first trimester and early second trimester. As your uterus grows heavier (particularly after week 20), lying flat on your back can compress the inferior vena cava and the aorta, which may reduce blood flow and cause dizziness, shortness of breath, or lightheadedness. Some women also notice a drop in fetal movement when lying flat on their backs.

The current guidance from most obstetric organizations is that if you find yourself on your back and wake up uncomfortable or dizzy, simply roll to your side — your body is usually an effective early warning system. The goal is not to spend the night in a rigid forced position, but to generally trend toward side sleeping.

On Your Stomach: Use Your Judgment

Stomach sleeping is fine in very early pregnancy when your belly is flat. As the bump grows, it becomes both uncomfortable and impractical. Some specially designed pregnancy pillows have a cutout for your belly that allows modified stomach positions — some women find this deeply restful in the second trimester before the belly is too large.

How to Use Pillows for Pregnancy Sleep

One of the highest-return investments for pregnancy sleep is the right pillow setup. You don’t necessarily need to spend $80 on a dedicated pregnancy pillow — though many women find the splurge worthwhile — but strategic pillow placement makes a real difference.

The Three-Pillow Setup (Works With Pillows You Already Have)

• Between your knees: Place a pillow between your knees while side sleeping. This aligns your hips and reduces the pull on your lower back and SI joint — a major source of pregnancy hip pain. A folded regular pillow works fine here.
• Under your belly: As the belly grows, supporting it from underneath with a pillow prevents it from pulling uncomfortably toward the mattress and straining your lower back.
• Behind your back: A pillow behind you gives you something to lean against if you naturally want to tilt slightly backward, preventing you from rolling onto your back.

C-Shaped Pregnancy Pillows

A C-shaped pregnancy pillow wraps around your front and back simultaneously — one end goes between your knees, the curve supports your belly and back, and the top tucks under your head. They work well for women who move around a lot during sleep, since the support moves with you.

U-Shaped Pregnancy Pillows

The U-shape provides support on both sides simultaneously, which is ideal if you switch sides frequently during the night. They’re bulky (you’ll need a king-sized bed or a very understanding partner), but many women who use them swear they’re transformative for sleep in the third trimester.

A Wedge Pillow for Targeted Support

A small wedge pillow is inexpensive, compact, and versatile. Positioned under your belly, under your hip, or behind your back, it provides targeted support without the full-body-pillow commitment. Many women keep a wedge on hand even after delivery.

Common Sleep Disruptors and How to Fix Them

Frequent Urination

Frequent nighttime urination — nocturia — is one of the most universally complained-about pregnancy sleep disruptors. Your blood volume increases by up to 50% during pregnancy, your kidneys work overtime, and the uterus presses directly on the bladder throughout all three trimesters.

What actually helps:

• Shift your fluid intake earlier in the day — aim to drink most of your water before 6 p.m. and taper off in the evening hours (but don’t restrict total daily fluid intake)
• When you use the bathroom before bed, lean slightly forward on the toilet to help fully empty the bladder
• Keep a dim nightlight on the path to the bathroom so you don’t have to turn on bright lights that reset your circadian rhythm
• Reduce diuretics like caffeine — see our guide on caffeine during pregnancy — especially after noon

Heartburn and Acid Reflux

Progesterone relaxes the lower esophageal sphincter — the muscle that keeps stomach acid where it belongs — and your growing uterus pushes stomach contents upward. The result: pregnancy heartburn that strikes with particular ferocity when you lie down.

What actually helps:

• Elevate the head of your bed by 6–8 inches by placing wedges under the mattress or bed frame legs (adding extra pillows under your head alone doesn’t work as well and can cause neck strain)
• Eat your last meal at least 2–3 hours before bedtime and keep it small
• Avoid trigger foods in the evening: citrus, tomatoes, chocolate, spicy dishes, fatty foods, carbonated drinks
• Sleep on your left side — this positioning keeps stomach acid below the esophagus due to stomach anatomy
• Ask your OB about antacids; calcium carbonate (Tums) is considered safe in pregnancy in moderate amounts

Leg Cramps

Sudden, intense calf cramps that jolt you awake — usually in the second or third trimester — are a near-universal pregnancy experience. The exact cause isn’t fully understood, but mineral imbalances (particularly magnesium, calcium, and potassium), reduced circulation, and nerve pressure from the uterus are all likely contributors.

What actually helps:

• Stretch your calves before bed: flex your foot upward (dorsiflexion), hold 30 seconds per side
• Stay hydrated throughout the day — dehydration worsens cramping
• Consider magnesium supplementation after discussing with your OB (many prenatal vitamins don’t contain magnesium; see our guide to best prenatal vitamins for comparison)
• When a cramp strikes: flex your foot hard toward your shin, straighten your leg if you can, and massage the calf firmly until it releases
• Eat potassium-rich foods: bananas, sweet potatoes, avocado, beans

Restless Leg Syndrome (RLS)

Restless leg syndrome — an uncomfortable urge to move your legs that’s worse at rest and worst in the evenings — affects roughly 1 in 4 pregnant women. It tends to peak in the third trimester and usually resolves after delivery. Iron deficiency is strongly associated with RLS in pregnancy, so it’s worth checking your ferritin levels if symptoms are significant.

What actually helps:

• Have your iron and ferritin levels checked; supplementation often dramatically improves RLS
• Reduce caffeine and avoid it entirely after noon
• Light stretching and walking in the evenings can reduce symptom severity
• Warm baths or leg massages before bed may provide temporary relief
• Avoid antihistamines (Benadryl, Unisom doxylamine — see sleep aids section) as they can worsen RLS

Back Pain

Pregnancy shifts your center of gravity forward, exaggerates the lumbar curve, and places significant strain on the muscles of your lower back and pelvis. Back pain affects up to 70% of pregnant women and is a primary reason for disrupted sleep.

What actually helps:

• The between-the-knees pillow setup (described above) is the single most effective intervention for pregnancy back and hip pain in bed
• A firm or medium-firm mattress is preferable; if your mattress is too soft, a mattress topper can help
• Prenatal yoga — specifically poses targeting hip flexor and lower back flexibility — practiced during the day improves nighttime comfort
• Pregnancy-safe exercises during the day (see our guide to pregnancy-safe exercises) strengthen the muscles that support the spine
• A maternity support belt worn during the day reduces the pelvic pressure that contributes to nighttime pain

Nasal Congestion

Pregnancy rhinitis — nasal congestion caused by increased blood flow and hormonal changes rather than illness or allergies — affects up to 30% of pregnant women and can make breathing uncomfortable at night.

What actually helps:

• A humidifier in the bedroom adds moisture that eases congestion without medication
• Nasal saline rinse (neti pot or saline spray) before bed clears congestion safely
• Nasal dilator strips (Breathe Right) physically open the nasal passages — completely safe during pregnancy and quite effective
• Elevating your head slightly can reduce stuffiness when lying down
• Avoid decongestant nasal sprays (Afrin/oxymetazoline) without OB guidance

Anxiety and Racing Thoughts

Pregnancy is a time of significant psychological adjustment, and nighttime — when there are no distractions — is often when anxiety about labor, the baby’s health, finances, and the enormity of what’s ahead surfaces. If anxiety is substantially affecting your sleep, this is worth discussing with your OB or midwife rather than treating purely as a “sleep problem.”

What actually helps:

• A consistent wind-down routine signals your nervous system that it’s safe to relax — bath, dim lights, no screens for 30–60 minutes before bed
• Journaling out worries before bed (“brain dump”) clears mental clutter and reduces the sensation that you have to “remember” things while trying to sleep
• Guided pregnancy meditations (apps like Calm or Insight Timer have pregnancy-specific content) can be genuinely useful
• If anxiety is pervasive and not improving, a brief course of cognitive behavioral therapy for insomnia (CBT-I) is considered safe and effective during pregnancy

Sleep Tips by Trimester

First Trimester Sleep Tips

Paradoxically, you’re often most exhausted in the first trimester but sleeping worst. Key strategies:

• Give in to naps strategically. A 20–30 minute nap before 3 p.m. takes the edge off first-trimester fatigue without disrupting nighttime sleep.
• Address nausea. Morning sickness that extends into the evening makes sleep difficult. Try keeping crackers by the bed and eating a small, bland snack before lying down. See our guide to morning sickness remedies for more strategies.
• Start left-side sleeping now. It’s easier to build the habit before you need it urgently.
• Don’t stress about pillow position yet. Your uterus is still small; comfort is the primary guide this trimester.

Second Trimester Sleep Tips

• This is the time to set up your pillow system. The belly is growing but not yet enormous — experiment with pillow configurations now so you have a system that works before the third trimester hits.
• Start prenatal yoga or pregnancy stretching. Flexibility and strength built in the second trimester pay dividends for third trimester comfort.
• Watch for RLS beginning. If you notice the unpleasant leg sensations starting, mention it at your next prenatal visit — catching iron deficiency early makes a significant difference.

Third Trimester Sleep Tips

• Accept imperfect sleep. Third trimester sleep is almost universally disrupted — research suggests this may be partly biological preparation for the fragmented sleep of newborn parenting. Working with this rather than fighting it reduces stress.
• Upgrade your pillow situation. If you haven’t invested in a pregnancy pillow yet and sleep is suffering, this is the trimester to do it.
• Watch for warning signs. Loud snoring, gasping, or significant daytime sleepiness despite adequate rest time can indicate pregnancy-related sleep apnea, which warrants evaluation.
• Prepare your postpartum sleep environment. Setting up a bassinet or co-sleeper that keeps the baby close while keeping your sleep surface separate makes those newborn nights safer and more manageable. Your hospital bag checklist is a good place to start thinking about the transition.

Sleep Aids: What’s Safe During Pregnancy

Most over-the-counter sleep aids have not been adequately studied in pregnant populations, and some that seem benign carry risks. Always discuss sleep aids with your OB or midwife before using them during pregnancy.

Unisom (Doxylamine): Sometimes Recommended

Doxylamine succinate (Unisom SleepTabs — hot Unisom SleepGels, which contain diphenhydramine) is an antihistamine that’s commonly combined with vitamin B6 to treat morning sickness. It can help with sleep, and many OBs are comfortable recommending it on a short-term basis. It can worsen restless leg syndrome, so it’s not appropriate for everyone.

Benadryl (Diphenhydramine): Use With Caution

Diphenhydramine is sometimes suggested by healthcare providers for short-term pregnancy insomnia, but it should only be used with explicit OB guidance. Some studies have raised concerns about associations with certain birth defects when used in the first trimester, though the evidence is not definitive.

Melatonin: Likely Fine in Low Doses, But Data Is Limited

Melatonin is a hormone produced naturally by your body. Low-dose melatonin (0.5–1 mg) is generally considered low-risk by many obstetric practitioners, but there is limited formal safety data. High-dose melatonin supplements (5–10 mg, common in the US market) are not recommended during pregnancy. Discuss with your provider if you’re considering melatonin.

Prescription Sleep Medications: Avoid Without Direct OB Guidance

Benzodiazepines and Z-drugs (zolpidem/Ambien, eszopiclone/Lunesta) are generally avoided during pregnancy due to concerns about fetal development and withdrawal risks. If insomnia is severe and behavioral approaches are failing, this is a conversation to have directly with your OB rather than a pharmacy decision.

Magnesium Glycinate: Well-Tolerated

Magnesium supplementation — particularly magnesium glycinate, which is gentle on the digestive system — is often recommended during pregnancy for leg cramps and has a mild sleep-promoting effect. Many prenatal vitamins don’t contain magnesium in meaningful amounts, and most OBs are comfortable with a supplemental 200–400 mg of magnesium glycinate in the evening.

Herbal Teas: Mostly Avoid

Many herbal teas marketed for sleep — including valerian, kava, and passionflower — are not considered safe during pregnancy due to insufficient safety data. Chamomile tea in moderate amounts is generally considered safe, but check with your provider if you’re drinking it regularly. Lemon balm and lavender are low-risk in culinary amounts.

When to Talk to Your Doctor About Sleep

Some sleep issues during pregnancy warrant medical evaluation rather than home management alone. Speak with your OB or midwife if you experience:

• Loud snoring, gasping, or witnessed apnea: Pregnancy significantly increases the risk of obstructive sleep apnea, which is associated with gestational hypertension, preeclampsia, and fetal growth restriction. If your partner reports that you stop breathing during sleep, or if you wake with headaches and unrefreshing sleep, request a sleep study evaluation.
• Severe, persistent insomnia that leaves you functionally impaired during the day
• Significant anxiety or depression that makes sleep impossible — perinatal mood disorders affect up to 1 in 5 pregnant women and are highly treatable
• Restless leg syndrome that is severe enough to significantly disrupt sleep — testing for iron deficiency is quick and important
• Unusual swelling, severe headaches, or vision changes that disturb sleep — these can be signs of preeclampsia that require prompt evaluation

Sleep deprivation during pregnancy is not simply an inconvenience. Poor sleep is associated with increased risk of gestational diabetes, preeclampsia, longer labors, and higher rates of cesarean delivery. It’s a clinical concern, not just a comfort issue — and you deserve support in managing it.

Frequently Asked Questions