How can i change my sleep habits? i am awake during the night and sleep during the day?

Slow changes: You'll need to slowly change the times you are awake and asleep by shifting things by an hour or so a week until you shift back to a normal day-night pattern. Using natural sleep aids like l-theanine and magnesium to help you sleep during night hours will help your body calm down and allow this change. Check local health food store for help with supplements.