All right, Xion. Don't exercise before resting, try to find some herbal relaxants to drink, they can mostly be found in special teas, whenever you feel sleepy, sleep, don't eat before you rest or you'll feel restless, try to drain yourself mentally by reading a book that's happy, try to identify what the nightmare is about and confront the problem when you wake up, make up a reason for staying awake: you'll be asleep in three hours, drink tons of alcohol, but, most importantly, always keep someone to talk to whenever your tired~! I can surely help you out and my inbox is always open, okay~?