This is because of several reasons. You have to follow this procedure, sure you can feel better.

1. Take dinner food very less.
2. Dring two cup of waters before you going to sleep.
3. Don't sleep straight way(Y axis shape), sleep one side(Right side or left side).
4. Don't think any matters on sleeping time, keep your mind free.
5. Don't sleep over 7 hours per day.
6. Try to avoid sleeping habit in afternoon or evening times.
7. After wake up, drink two cups of waters, it makes your blood circulation fast and active your body fresh.

Try this, you feel better.