DD will be 9 mos next month and she sleeps from 10pm to 10am. sometimes she'll wake up in the middle of the night maybe one or twice, but most nights she doesn't wake up at all. after she wakes up for the day, she'll take a nap usually every 1.5 to 2 hours, sometimes she'll stay awake for a stretch of 3-4 hours if she's having fun. is it normal she's only awake for that amount of time? i feel like at her age she should be awake longer?