posted on Oct, 15 2008 @ 11:03 PM
What you are having is called Sleep Paralysis, and it is very common.
Sleep paralysis is a condition characterized by temporary paralysis of the body shortly after waking up (known as hypnopompic paralysis) or, less
often, shortly before falling asleep (known as hypnagogic paralysis).
Physiologically, it is closely related to the paralysis that occurs as a natural part of REM (rapid eye movement) sleep, which is known as REM atonia.
Sleep paralysis occurs when the brain awakes from a REM state, but the bodily paralysis persists. This leaves the person fully aware, but unable to
move. In addition, the state may be accompanied by hypnagogic hallucinations.
More often than not, sleep paralysis is believed by the person affected by it to be no more than a dream. This explains many dream
recountings which describe the person lying frozen and unable to move. The hallucinatory element to sleep paralysis makes it even more likely that
someone will interpret the experience as a dream, since completely fanciful, or dream-like, objects may appear in the room alongside one's normal
Sleep paralysis occurs during REM sleep, thus preventing the body from manifesting movements made in the subject's dreams. Very little is known about
the physiology of sleep paralysis. However, some have suggested that it may be linked to post-synaptic inhibition of motor neurons in the pons region
of the brain. In particular, low levels of melatonin may stop the depolarization current in the nerves, which prevents the stimulation of the muscles,
to prevent the body from enacting the dreamt activity (e.g. preventing a sleeper from flailing his legs when dreaming about running).
Many people who commonly enter sleep paralysis also suffer from narcolepsy. Especially in African-Americans panic disorder often co-occurs with sleep
paralysis. However, various studies suggest that many or most people will experience sleep paralysis at least once or twice in their lives.
Some reports read that various factors increase the likelihood of both paralysis and hallucinations. These include: 
Sleeping in an upwards supine position
Irregular sleeping schedules; naps, sleeping in, sleep deprivation
Sudden environmental/lifestyle changes
A lucid dream that immediately precedes the episode. Also conscious induction of sleep paralysis is a common technique to enter a state of lucid
dreams, also known as WILD .
Artificial sleeping aids, ADD medications and/or antihistamines
Recent use of hallucinogenic drugs
During paralysis episodes, patients may be advised to try moving the facial muscles and moving eyes from one side to the other. This may hasten the
termination of the attack.
Clonazepam is highly effective in the treatment of sleep paralysis. The initial dose is 0.5 mg at bedtime, while an increase to 1 mg per night
might be necessary to maintain potency. Anecdotal reports indicate SSRIs such as fluoxetine markedly decrease the incidence of sleep paralysis.
Several people who have been both on and off SSRIs have reported corresponding decreases and increases in sleep paralysis episodes. Others report no
effects at all.
Hope this helps, just google it to get more information.............