Sleeping in pregnancy: positions, insomnia and the things that keep you awake

Positions, and what the left-side advice really means

From around the second half of pregnancy, side-sleeping is recommended — the left side is often suggested because it optimises blood flow through the major vein that runs on the right side of the spine. Either side is fine; the point is not to settle to sleep flat on your back.

Waking up on your back happens to everyone and is not a disaster. Roll onto your side and go back to sleep. The body usually protests before harm occurs — many women wake feeling breathless or dizzy on their back, which is the mechanism working.

Build the pillow fort: one between the knees, one supporting the bump, one behind the back. A full-length pregnancy pillow is a luxury, not a necessity — ordinary pillows do the same job.

Stomach sleeping becomes impossible on its own as the bump grows; before that it is safe, and no baby has been harmed by a mother's sleeping position in early pregnancy.

What keeps you awake, and what to do

Bladder: cut fluids in the hour before bed but not during the day — dehydration causes cramps and contractions. Lean forward when emptying the bladder to empty it more fully.

Heartburn: eat dinner two to three hours before lying down, keep meals small, avoid fried and very spicy food in the evening, and raise the head end of the bed rather than piling pillows under the head. Ask your doctor about safe antacids rather than using a soda-and-water home remedy.

Leg cramps: stretch the calves before bed, stay hydrated, and pull the toes up toward the shin during a cramp with the leg straight. Discuss calcium and magnesium with your doctor.

Restless legs: an irresistible urge to move the legs at night, common in pregnancy and linked to low iron. Get haemoglobin and iron stores checked; reduce caffeine; stretch and walk before bed.

The busy mind: keep a notepad by the bed for the list that arrives at midnight, keep the phone out of the bed, and accept a nap in the day rather than fighting for eight consecutive hours at night.

Snoring, apnoea and blood pressure

Snoring increases in pregnancy as tissues swell, and it is usually harmless. What is not harmless is obstructive sleep apnoea — snoring with pauses in breathing, gasping or choking awakenings, and severe daytime sleepiness.

Sleep apnoea in pregnancy is associated with higher blood pressure, pre-eclampsia and gestational diabetes, and it is treatable. If your partner reports pauses in your breathing, tell your obstetrician.

Also mention: severe daytime sleepiness that is out of proportion, morning headaches, and any new snoring accompanied by swelling or raised blood pressure readings.

When to see a doctor

Same-day: severe headache with visual changes; sudden swelling of face and hands; chest pain or severe breathlessness; one-sided calf pain or swelling; reduced fetal movements; regular contractions before 37 weeks; or bleeding.

Discuss at the next visit: insomnia that is affecting daily functioning, restless legs (get iron checked), snoring with pauses in breathing, persistent heartburn that is not controlled, night-time itching of palms and soles without a rash (which needs a liver test, not a sleep remedy), and severe daytime exhaustion.

This article is general information, not medical advice, and is no substitute for personal medical advice. For any decision about your or your child's health, please consult your doctor.

Frequently asked questions

Q: I woke up on my back and panicked. Have I harmed the baby? — No. Occasional back-sleeping in your sleep is not what the guidance addresses; settling deliberately on your back for long periods is. Roll over and go back to sleep.

Q: Are sleeping tablets safe in pregnancy? — Do not take anything without your obstetrician's approval, including antihistamines and herbal sleep aids. Some options are considered acceptable in specific situations, and that judgement belongs to your doctor.

Q: Should I nap in the day? — Yes, if you can. Sleep in instalments is legitimate, and daytime rest reduces the exhaustion that makes everything else worse. Keep naps under an hour late in the day if they are affecting night sleep.

Q: Does bad sleep in pregnancy affect the baby? — Ordinary broken sleep does not harm the baby. Untreated sleep apnoea, on the other hand, is associated with real complications — which is why the snoring-with-pauses question is worth raising rather than accepting as a joke.