Lying in bed on my right.as i am about to fall asleep,suddenly feel heart beating fast,chest tight,cold,checked bp,its high.if remain awake,im fine.

Hypnogogic panic: Hypnagogic (ie falling asleep) panic attacks occur, often part of a myriad of symptoms in this transitional state between wakefulness and sleep (hypnagogic hallucinations being the most frequent). There are medications as well as cognitive behavioral treatments as treatment; for some patients, just having knowledge of these are sufficient as therapy. See your doctor if bothersome.