Ds is 2.5 and still has a weird sleeping pattern . He either :
Falls asleep for a nap late afternoon , sleeps for about 2-2.5 hours , then doesn't go to bed at night until well after 10pm sometimes even after 11 .
Or
Stays up during the day and goes to bed fine at 7 . But wakes up during the night for hours , usually about 1-4 .