You are 16 months old now. So why are you suddenly sleeping like a newborn? There's no need to be up 5 times at night and wake Mommy for the day at 4:30 am. You've done this a bunch of nights in a row now, so don't go thinking this is our new normal. Mommy has to work. Mommy needs sleep. Please, please have mercy on Mommy. She's fried.