5. Make up for lost sleep.
Pay back your sleep debt in a timely fashion. Make up for any lost sleep as soon as possible. Sleep loss is cumulative. If you lose several hours on a given night, you will become more and more sleepy in the ensuing days, even though you get your "normal" sleep, so pay back your sleep debt. But remember: you cannot replace lost sleep at once. When you sleep longer to catch up, try to do so by going to bed earlier than usual. You cannot make up for large sleep losses during the week by sleeping in on the weekends. A nap during the day can help you pay back your sleep debt. The important rule is to return to your regular sleep schedule as soon as possible.