4am wake ups

[Lottiebugz22]

My 23 month was an amazing sleeper apart from teething. Suddenly she's waking at 4am every morning and I'm exhausted. It's so out of the blue. I've tried everything, she sleeps in a dark room, she still naps around 45-1 hour a day. She's not teething or unwell. What could this be?

She's a baby. They are irrational. And at that young age things change all the time. Only one wake up sounds pretty good to me. My 10 month old only slept through the night maybe 10 times so far....usually wakes up once for a feed.