bedtime

Youngest was about 2 and very compliant, most of the time. 

He'd go to bed  and get up early, and happily take naps during the day, sometimes one in the morning and one in the afternoon.  Honestly he didn't know there was an option.

Then one day on vacation, he realized that all the napping was robbing him of serious play time, and when I picked him up to put him in his bed for an afternoon nap that I needed, he looked at me earnestly and said "Is it time a go a bed again?"