Curb the caffeine
Limit it. In addition to the usual sources (coffee, tea and soda) be aware of caffeine in chocolate and in medications used to treat headaches, colds and sinus congestion.
Nicotine impairs the ability to fall asleep and stay asleep.
Watch the alcohol
Even though drinking alcohol may make it easier to fall asleep, as few as one or two drinks within two hours of bedtime tend to disrupt your sleep and lead to more frequent awakening in the latter half of the night.
Lack of physical activity during the day is associated with increased sleep problems. But strenuous exercise too close to bedtime may make it more difficult to fall asleep.
Eat dinner earlier
Eating too much food close to bedtime may make falling asleep and staying asleep more difficult.
Skip the nap
Naps can make it harder to fall asleep at night. If you can't get by without one, limit it to less than 30 minutes.