first of all do not put any extra effort for sleeping. what you have written it does not mean that you have insomnia.insomnia has some specific symptoms better to consult with a doctor.

as primary advise try to follow these
1)no sleeping pill or alcohol.
2)less stress.
3)enough physical exercise
4)no reach food
5)no tea or coffee after afternoon.
6)no smoking.

hope you all the best