My just turned 3 year old is exhausted. She has been going to sleep well by 730 every night since dropping her nap over 6 months ago. But for the last 10 nights she's been in bed for about 2 hours falling asleep any time after 9, most nights not long after 9 but one night after midnight. So she's been having tantrums in the day. She was potty trained at 23 months so it's not that. She's been sleeping well at night since 18 months, so half her life but now she seems to have regressed. Anyone in the same boat?