Anyone know how to STOP interrupting people??

Yeah, I always always know not to speak but CANNOT sit on, and suppress the urge to do it. I'm tired of annoying my gentle, patient best friend when she's just as tired of me. I would be annoyed if I was sitting next to me. I'm predominantly impulsive, unmedicated. I'll try anything! Sleep deprivation makes it worse. But what's college without a little of that?