What are good relaxation techniques?

I was bullied really really really badly for a good portion of my life. Plus I've got baggage from my childhood. Because of this when I lay in my bed my brain starts winding up and I have trouble sleeping. Second part, does anxiety get treated with medical marijuana? I ask because in high school smoking pot would help me sleep better then I ever had. My grades even went up while I was smoking. I could take a couple hit and be asleep in the wink of an eye.