Go to your bed only when you are feeling sleepy, don't sit or lie down unless you are feeling sleepy. Try to have a gap of a few hours between your dinner and sleeping time. Avoid having tea or coffee, and being near TV, mobile or any gadget. All these are known to be stimulants and they don't allow the mind to get into a relaxed mode for sleeping. Try to not do any official/heavy/stressful work a few hours before sleeping. All these tips would help your mind to get into a mode which is most conducive for sleeping