Sleep can change throughout pregnancy, but not everyone follows the same trimester-by-trimester pattern. Tiredness is especially common in the first 12 weeks. Later, a growing bump, discomfort and more frequent trips to the toilet can make sleep harder. Nausea, heartburn, leg discomfort, vivid dreams or worries can also interrupt rest at different times.
Early pregnancy: make room for rest
Hormonal and physical changes can contribute to strong tiredness. Rest when you can and accept practical help if it is available. If nausea is also making sleep difficult, small plain meals and regular fluids may be easier to tolerate for some people. Contact your maternity team if vomiting is severe, you cannot keep fluids down, or you have signs of dehydration.
Some people sleep better in the middle months; others do not. A change from someone else’s experience is not evidence that anything is wrong. Tell your midwife or doctor if exhaustion or insomnia is affecting everyday life rather than assuming you must endure it.
Later pregnancy: comfort and position
Pillows under the bump or between the knees may make side-sleeping more comfortable. For heartburn, official guidance suggests smaller meals, avoiding food close to bedtime and raising the head and shoulders; ask your midwife, pharmacist or doctor for advice if symptoms continue.
From 28 weeks, begin every sleep — including naps — on either side. Left and right are both suitable. If you wake on your back, do not panic: turn onto your side and settle again. The recommendation is about the position in which you go to sleep, not about staying in one position all night.
Leg discomfort and restless legs
Leg cramps can disturb sleep and their cause is often not clear. Gentle calf stretching may help some people. Restless legs can also occur in pregnancy. Because similar symptoms can have different causes, discuss persistent or troublesome symptoms with a midwife or doctor rather than assuming you need a supplement. Seek prompt advice for one-sided swelling, redness, warmth or persistent pain.
Small changes that are supported
Try a calm wind-down before bed, reduce tea, coffee and cola in the evening, and continue pregnancy-appropriate daytime activity when your care team says it is suitable. If a late nap repeatedly makes it harder to sleep at night, try moving or shortening it; you do not need to avoid all daytime rest. Ordinary pillows or a pregnancy pillow may improve comfort, but no product is essential.
Do not start a sleep medicine, antihistamine, magnesium, iron, herbal product or other supplement just because it is marketed as “natural” or pregnancy-friendly. Check medicines and supplements with a doctor, midwife or pharmacist, and do not stop prescribed medicine without advice.
When sleep needs a wider conversation
Talk to a midwife or doctor if insomnia is persistent or distressing. If it comes with ongoing hopelessness, loss of interest, severe anxiety or thoughts of harm, seek mental health support promptly; use emergency help if anyone may be in immediate danger.
Contact your maternity team urgently for reduced or changed baby movements; do not wait until the next day. Also seek urgent medical or maternity advice for vaginal bleeding, severe headache, new visual disturbance, sudden swelling, chest pain, fainting, severe breathlessness, or breathlessness while lying down.
This guide supports, but does not replace, advice from the team caring for your pregnancy.