If you must nap, do so in the morning or early afternoon and limit its length to no more than one hour. Exercise regularly, but not within six hours of bedtime. Avoid the use of caffeine and alcohol within four to six hours of bedtime. Avoid smoking and the use of nicotine close to bedtime. Avoid eating a large meal close to bedtime.
Some people find that a light snack just before bedtime facilitates better sleep.
Minimize extremes in temperature, light, and noise in your bedroom.