It's rather simple to correct; pull an all-nighter, then go to sleep at say 10PM tomorrow night, setting your alarm for 9AM. Slowly work the alarm back to 6 or 7, whatever time you want to get up. You shouldn't have any problem falling asleep, but if you do, a mug of Horlicks will do the trick.
Have 3 meals a day - brekkie, lunch and dinner.