Children should get used to a routine....get them to bed early, so they can get up early.
"Early to bed, early to rise makes a person healthy, wealthy, and wise".

Both my children who are below 6 years get up by 6:00am. We have a routine that we stick to. Makes my life easier and it's comforting to the kids because they know the pattern they have to follow.

Let kids get a taste of the real world, not a pampered, gold fish bowl existence.