Some tips
First thing first : steady sleeping pattern
Right nutrients closest to nature
Exercise consistently
Drink plenty of water, spread throughout the day
Read something boring or newspaper or even blogs
Sleep when you’re sleepy
Avoid watching movie or any tv shows 60-min before sleep
No caffeine (coffee / tea / soft drink) 4-hour before sleep
Light beverage / drink 1 or 2 hours before sleep
Even some small portion of meat helps a lot
Some suggest milk, well it depends
Comfortable & cooler environment