Melatonine is the solution
Is not a quimic, is a hormon necessary to sleep, all humans produce melatonine, for some bodies reduce the production ot the hormon, old people,women in menopaise, your people with stress, etc.
you could go to a naturis shop and buy a pill of melatonine. is not unhealty, only is to help your body to take rest in good condition.
youo could eatlettuce at night and warm milk.