You should be able to find it in any health food store, or like GNC, the vitamin shoppe...I order stuff from bodybuilding.com. Don't worry about getting used to sleeping during the day...you'll fall back into a normal schedule once you're done with your job. Obviously it hasn't gotten to you yet..but sleep deprivation is NOT fun. When you're suffering from it, you won't be worried about sleeping during the day. Other things to help? Black curtains/blinds. The night schedule is hard to follow, but by staying up all day on your days off you're just messing everythign up again.