. Never oversleep

Never oversleep because of a poor night's sleep. This is the most crucial rule. Get up at about the same time every day, especially on the morning after you've lost sleep. Sleeping late for just a couple of days can reset your body clock to a different cycle -- you'll be getting sleepy later and waking up later.

2. Set your body clock

Light helps restart your body clock to its active daytime phase. So when you get up, go outside and get some sunlight. Or if that's difficult, turn on all the lights in your room.
Then walk around for a few minutes. The calves of your legs act as pumps and get blood circulating, carrying more oxygen to your brain to help get you going.

3. Exercise

Keep physically active during the day. This is especially important the day after a bad night's sleep. When you sleep less, you should be more active during the day. Being less active is one of the worst things an insomniac can do.
Strenuous exercise (brisk walking, swimming, jogging, squash, etc.) in late afternoon seems to promote more restful sleep. Also, insomniacs tend to be too inactive a couple of hours before bed. Do some gentle exercise. A stretching routine has helped many people.

4. Don't nap

Do not take any naps the day after you've lost sleep. When you feel sleepy, get up and do something. Walk, make the bed, or do your errands.
While studying, get up regularly (every 30 minutes, or more often if necessary) to walk around your room. Do a gentle stretch. That will increase the flow of oxygen to your brain and help you to be more t go to bed until 2 a.m. No naps! Make the time you spend in bed sleep time. Still some insomnia? Go to bed proportionately later. Then, as your time in bed becomes good sleep time, move your going-to-bed time back 15 to 30 minutes a night and do that for a week or so.
This is the opposite of what we want to do: we want to go to bed earlier to make up the lost sleep. Learn to do what many sleep laboratories teach -- go to bed later the night after losing sleep.