Since your body temperature drops to it’s lowest while you sleep, doing what you can to help it out will increase your chances of falling asleep and remaining there.
Research is divided whether the drop in body tempurature is the reason you go to sleep or a by product of minimizing movement, in either case, keeping the room cool and slowing things down, is your way of helping the process.
Good Luck!
– Dr. Vik, The Culture King