My 3 year old is in bed by 7pm every night except for when I am off work and I let her stay up until 8pm (through the week we wake up at 5am). My 8 month old goes to sleep every night at 730 and sleeps all night long...(I am very lucky).
Heck my little one was about 16 or 18 months old, she would literly walk the crib rail like she was walking the highwire...Scared the bejeebers out of me. We are getting ready to get her a "big girl bed" she is soooooooo excited!