Insomnia during pregnancy

By trimester

Weeks 1–13

1st trimester

Daytime fatigue from rising progesterone and more nighttime bathroom trips are the usual culprits now. An earlier nap, a consistent sleep schedule, and cutting caffeine later in the day typically help.

Weeks 14–27

2nd trimester

This is often the best-sleep trimester for many people. If new insomnia shows up now, it may be linked to anxiety or reflux, so mention it to your provider.

Weeks 28–birth

3rd trimester

Physical discomfort and reflux tend to be the main culprits now. See our third-trimester insomnia guide for more specific tips.

What does the evidence show for insomnia?

• Side-sleeping, especially on the left side, is generally recommended in the second and third trimesters, since hormonal changes already make sleep harder. 1
• Sleep-hygiene basics, like a consistent schedule, a cool dark room, and side-sleeping with support, are the standard first step for pregnancy insomnia. 2
• Magnesium has been studied for sleep support in adults generally, and can be used in pregnancy within the 350 mg per day upper limit, with your provider's guidance. 3
• Occasional short-term use of diphenhydramine for sleep is broadly considered acceptable in pregnancy at standard doses. Daily long-term use should be discussed with your provider. 4
• Sleep apnea shows at night as breathing that starts and stops, frequent loud snoring, and gasping for air, and by day as sleepiness that affects focus and reactions, fatigue, headache, dry mouth, insomnia itself, and waking often to urinate, with a sleep study the way it gets sorted out. 5

When should I call my provider about insomnia?

Pregnancy insomnia is usually a comfort and scheduling problem. The version that needs a provider is the one with breathing attached: frequent loud snoring, gasping for air, or a partner noticing your breathing start and stop in the night. Daytime sleepiness heavy enough to affect focus and reactions, morning headache, dry mouth, or waking again and again to urinate point the same direction, and sorting that out takes a sleep study rather than better sleep hygiene. Raise it rather than waiting, since insomnia is itself one of the daytime signs on that list. Whatever the pattern, any symptom that feels beyond your usual range is a reason to call: obstetric teams expect these questions and would rather hear early than late.