At night, as I lay down on my bed, as I start to fall asleep I get this weird feeling in my head. I don't know how to describe it, but it gets all tingly and sometimes feels a bit cold and I can also hear something like my head is being put against pressure. And I try to hold it in to see if it is sleep paralysis, but I'm kind of skeptical and don't want to screw something up and make matters worse. So, can anyone give insight on this?