Weird twitch in my head when I lie down?!

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There are numerous possible causes of muscle twitching. They include:

Diet deficiency
Drug overdose (caffeine)
Drug side effect (such as from diuretics, corticosteroids, or estrogens)
Exercise
Twitches not caused by disease or disorders (benign twitches)
Often affecting the eyelids, calf, or thumb
Normal and quite common, often triggered by stress or anxiety
Come and go, and do not last for more than a few days

Nervous system conditions that can cause muscle twitching:

Amyotrophic lateral sclerosis (ALS - Lou Gehrig's disease)
Damage to the nerve that leads to a muscle
Muscular dystrophy
Spinal muscular atrophy
Weak muscles (myopathy)

Symptoms that suggest a nervous system disorder include:

Loss of, or change in sensation
Loss of muscle size (wasting)
Weakness

There is usually no treatment necessary for benign muscle twitching. Call your health care provider if you have long-term or persistent muscle twitches.

http://www.nlm.nih.gov/medlineplus/ency/…