Researchers recommend sleeping for 7-9 hours per night. Even small deficits can pose problems like decreased athleticism, diminished brain function, increased inflammation and a greater likelihood to get sick- sleeping only 6 hours per night makes you four times more likely to catch a cold when compared to sleeping 7 or more hours.
Ideally, eat your last meal 3-4 hours before bedtime and especially limit heavy, spicy or high-fat foods. Ration how much you drink before bedtime to minimize bathroom breaks. Particularly limit caffeine in the afternoon and evening- caffeine has a half-life of 6-9 hours and can keep you awake long after the last sip. http://ow.ly/i/xY1tM