Do not let the hours fluctuate from night to night or from week to week. That is how you can see your daily performance on a given task slip dramatically. A remedy that has been suggested for the sleep deprivation in high school students, has been to change the school hours so that students are functioning and studying in school at their best hours of the day. The change of hours would accomodate for the teenagers need to catch up on their sleep. This is provided that they use the change to their benefit, and are not delinquint about responsibilities.
Naps are a good thing.
Everybody should consider making nap time a part of their everyday life. Not just pre-schoolers. It's date is January, 4th, 2000.