According to Sadhguru, a highly-regarded Indian guru suggests that you should do 5 things before going to sleep. In brief:
Do not eat within 3-4 hours of sleeping
Shower (particularly in lukewarm water)
Oil Lamp
Participate in meditative practices
Repeat "I am not this body, I am not this mind" until you fall asleep
For the full video, view this link: https://www.youtube.com/watch?v=F5378Ag9EjA