9-week-old preterm baby suddenly started staying awake until 3–5 AM — is this a circadian rhythm phase? Can I help her?
My baby is 9 weeks old, born preterm at 35+1 weeks.
For the past 1–2 weeks, her nights have suddenly become very difficult. She sometimes doesn’t settle until 3–4 AM, and occasionally even 5 AM. During the day, however, she sleeps quite well and mostly wakes only for feeds.
We saw her pediatrician and he said everything is normal. He explained that because she was born preterm, her circadian rhythm is still developing/forming.
What I’m struggling to understand is: if her circadian rhythm is still developing, why was she able to fall asleep around 1 AM until 1–2 weeks ago, but now she suddenly stays awake until 3–5 AM? What changed?
Is this some kind of developmental transition or day/night confusion? Is there anything I can actively do to help her shift her sleep earlier, or is this something that will naturally improve as her circadian rhythm matures?
Would love to hear from other parents, especially parents of preterm babies. When did this phase improve for your baby?