A rub a few drops of lavender oil on the wrists before going to sleep. It is soothing.
Make sure that if you drink milk, tea or whatever drink to help you sleep is cold. This is because when the body is asleep, the internal temperature decreased with respect to the skin temperature (why is your partner when he / she is sleeping warmer than if he / she is awake) What also helps is good to about an hour and a half before bedtime take a warm bath or hot shower. In this way, preheat the whole body and the time between the heating and going to bed is gives the body time to cool down through the skin, which therefore remains warm longer.