What causes muscle twitches and involuntary jerks all over my body when I try to get to sleep and relax? I have had this the past year. I'm 44 years old. Now when I lay down to sleep, or sometimes just laying down relaxing watching t.v....I have no control over these muscle jerks and twitches. It often keeps me awake up to an hour, just trying to get to sleep. It only happens when I relax. My arm, my legs, whatever...even in my face..twitch and jerk. It's awful! I do have other health problems and I have severe insomnia. I wonder if it is due to vitamin deficiencies, lack of exercise/oxygen or possible medication problems.
Anyone ever heard of this? Please help. Thank you!!

Summarized question: What causes muscle twitches and involuntary jerks all over my body when I try to get to sleep and relax?