My 6 year old and 3 year old son's both go to bed at 7.30pm school night and sunday nights, friday and saturday i let them stay up until 8.30pm.

I agree each child is different some children need more sleep then others but i know with my 6yr old if he goes to bed past 7.30pm i'm having to wake him for school (that if his brother hasn't beaten me too it)