By Leah Jaakkimainen - Posted on Apr 11, 2012 14 1 8pm. But when school is all day, start the bedtime routine around 7pm and so the child is asleep at 8. ( Assuming school starts at 8am and the child would need to be awake by 7am) Most kids need approx. 10 hours of sleep at this stage. Make sure there is no napping during the day and are active indoors and out. 13 By Leah Jaakkimainen - commented on Apr 11, 2012 14 1 When it comes to time changes, make sure to start implementing 15 minute increments of bedtime changes over about 2 weeks and when the clocks go back or forward, the change in schedule is not soo drastic.