What Is The Treatment For Tremor?

My husband has whole body tremors while sleeping...he does have sleep apnea...still has his tonsils and is somewhat over weight...but the tremors are worrying us....he is not aware he is doing it.

We have read several things and myoclonus keeps popping up. Even his fingers will straighten out and his index finger will move up and down...should we be worried or just how he sleeps. We have only been together a year now but I noticed it the first night we slept together so I can't say if he was doing it before then.