Does breastfeeding hormones cause long-term insomnia?

Question

Hello doctor,

My 29-year-old sister has been dealing with chronic insomnia since having her baby 14 months ago, and it is only getting worse. She takes two to three hours to fall asleep every night, even when she is exhausted, and then wakes up multiple times before morning. Her OB said it is normal after pregnancy, but this seems way beyond normal tiredness.

She has tried melatonin, chamomile tea, meditation apps, everything, but nothing helps for more than a few days. The lack of sleep is affecting her milk supply while breastfeeding, and she is worried about taking sleeping pills because of nursing.

Her husband works early shifts, so she handles most night feedings, but even when the baby sleeps through the night, she still cannot sleep. started having anxiety attacks during the day from being so tired, and her mind just races at bedtime thinking about all the things she needs to do. Her thyroid levels were checked six months ago and were normal.

Caffeine makes insomnia worse, but she is so tired during the day that she needs coffee just to function. Can breastfeeding hormones cause long-term insomnia problems?

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I can understand your concern.

This does sound like more than the usual post-baby tiredness. What you are describing is more like postpartum-related chronic insomnia with anxiety on top. Breastfeeding hormones (prolactin, oxytocin) usually push toward sleepiness, not insomnia. But after delivery, estrogen and progesterone shifts, plus the cycle of disrupted nights, can “reset” the brain into this pattern.

Once the mind starts linking bedtime with stress, it becomes a loop. Melatonin and teas won’t fix that if the brain is stuck in hyper-arousal mode.

The probable causes:

Likely a combination of postpartum hormonal shifts, plus ongoing sleep disruption from baby care, plus an anxiety pattern around bedtime.

Investigations to be done:

Basic repeat thyroid panel (TSH- thyroid-stimulating hormone, free T4- thyroxine).
CBC - complete blood count (rule out anemia).
Vitamin D and B12 levels.
Screening for postpartum depression/anxiety (Edinburgh scale).

Differential diagnosis:

Postpartum anxiety disorder.
Primary insomnia (unmasked by delivery).
Thyroid or nutritional deficiency.
Less likely: sleep apnea, though if snoring/daytime sleepiness exists, it is worth ruling out.

Probable diagnosis:

Postpartum insomnia with anxiety overlay.

Treatment plan:

• First step is sleep hygiene, but stricter: no caffeine after morning, dim lights at night, same sleep time even if she does not feel sleepy.
• Cognitive behavioral therapy for insomnia (CBT-I) works best in these situations.
Short naps in the day, but keep them.

Regarding follow-up:

I would suggest she keep a two-week sleep diary (bedtime, wakeups, caffeine intake) and update here.
Also, get the blood tests I mentioned and share the results. If anxiety attacks are daily, she must see a psychiatrist alongside, while I can guide on the OBG side regarding hormones and lactation safety.
Please follow up with details of tests, feeding schedule, and how often she gets total sleep in 24 hours.

Preventive measures:

Limit coffee strictly.
Regular exercise and walking in sunlight.
Avoid screens at least one hour before bed.
Hand over at least one night feed to husband (expressed milk or formula if she is okay) so her brain can relearn to trust sleep.

I hope this helps.

Kindly follow up if you have more concerns.

Thank you.