DD (5 months) is bf except for a bottle of formula before bed - on the basis that her sleep couldn't get any worse and the plural of anecdote is data!
Bedtime isn't fixed, depends on when she has napped, but usually 7.30 - 8.30pm.
Every night this week she has fallen asleep after the bottle with zero fuss, and woken up 2-3 hours later ready to play for a couple of hours. She is currently lying on our bed playing with her feet while i ignore her.
This has happened both on a day when she only had about 2 hours sleep during the day so was horribly overtired but also a day when she had 4.5 hours!