Insomnia in the third trimester

By trimester

Weeks 28–birth

3rd trimester

Tackle whatever's driving your insomnia. For reflux, try raising the head of your bed or an antacid. For frequent bathroom trips, stop drinking fluids at least 2 hours before bed. For back or hip pain, try extra pillow support or pelvic-floor therapy. For restless legs, ask your provider to check your iron levels, since magnesium may help under their guidance.

What does the evidence show for insomnia in the third trimester?

• Sleep trouble is a common third-trimester complaint, driven by a mix of hormonal changes, physical discomfort, and other symptoms. 1
• Side-sleeping, especially on your left side, is generally recommended in the second and third trimesters for both comfort and healthy blood flow. 2
• Iron deficiency is a common contributor to restless legs, so it's worth checking iron levels if that's part of your third-trimester insomnia. 3
• Occasional, short-term antihistamine use at standard doses is a reasonable option for pregnancy sleep troubles, under your provider's direction. 4
• Frequent snoring of three or more nights a week is a risk factor researchers use to flag sleep apnea in pregnancy, and sleep apnea during pregnancy has been linked to a higher risk of hypertensive disorders and gestational diabetes. 5

When should I call my provider about insomnia in the third trimester?

New or worsening snoring, three or more nights a week, or pauses and gasping in your breathing during sleep are worth flagging to your provider rather than filing under ordinary third-trimester discomfort, since that pattern is what researchers use to flag sleep apnea in pregnancy. This distinction matters beyond rest itself: sleep apnea during pregnancy has been linked to a higher risk of hypertensive disorders and gestational diabetes. Restless, hard-to-settle legs that disrupt your sleep night after night are also worth a mention, since a quick check of your iron levels can rule out an easy, fixable contributor. 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.