Help, what is wrong...

1. SLEEP STARTS
Most people have experience the common motor sleep start - a sudden, often violent, jerk of the entire body that occurs upon falling asleep. Other forms of sleep starts also occur just as sleep begins such as;
visual sleep start - usually a sensation of blinding light coming from inside the eyes or head
auditory sleep start - a loud snapping noise that seems to come from inside the head
The different types of sleep starts can be frightening, but these occurences are harmless.
2. sleep-wake transition disorders

3. hypnic jerk - also called sleep starts; the sensation of falling and then a physical jerk into wakefulness, usually during Stage 1 sleep

4. Normal NREM parasomnias
Hypnagogic or hypnopompic imagery (a state of feeling awake but having dreams intrude; occurs at sleep onset or offset)

Sleep starts or hypnic jerks (typically a myoclonic jerk occurring at sleep onset, but also manifested rarely as a sudden flashing light, loud cracking, snapping noise, or sudden pain)

5. Hypnagogic sensations
The hypnagogic experience occurs between being awake and asleep, while the hypnopompic experience occurs as one is waking up; both experiences occur within the time period between sleep and waking (or vice versa). Experienced qualities vary, and include fear, awareness of a "presence," chest or back pressure, and an inability to breathe (hence the folkloric notion of mara-like creatures tormenting sleepers), a falling sensation or a feeling of tripping, but sometimes also joy.
During the hypnagogic state, an individual may appear to be fully awake, but has brain waves indicating that the individual is technically sleeping. Also, the individual may be completely aware of their state, which enables lucid dreamers to enter the dream state consciously directly from the waking state (see wake-initiated lucid dream technique).
The hypnagogic state is sometimes proposed as an explanation of experiences such as alien abduction, apparitions, or visions.

6. The hypnagogic state is the condition the human mind reaches shortly before sleep. It is similar to REM sleep in that it is often bizarre and nonsensical, though it is far shorter and less directly related to the subconscious mind than REM sleep is. It prepares the mind for REM sleep.
Basically what happens during this state is that random images and thoughts float through your mind, sometimes related to recent events but mostly just really random strata. Whether you fall asleep within 30 seconds of getting into bed or you need an hour to go to sleep, your mind will eventually pass through the hypnagogic state, for however brief or long a time. Light sleepers often linger in this state, as it is easily interruptable by outside stimuli and isn't actually normal sleep.
Unlike sleep, your mind is really powerless during this state -- you can't dream or get the rest your mind needs at this time. Lucid dreams, or dreams where the mind wakes up and realizes it's dreaming while the body remains asleep, also cannot occur during this state. What happens is more or less just your mind channel-surfing along the proverbial UHF channels of the mind, only past channel 80 -- snow, static, random images, snippets of conversation, voices, etc.
The hypnagogic state is also related to schizophrenia. See the connection? The only difference is that a schizophrenic is fully awake for the ride, whereas the nearly-asleep person is barely conscious of what they're perceiving.

7. Modafinil does not carry the addiction potential that methylphenidate and dextroamphetamine do. In fact, the latest development in treatment is a new modafinil drug called Provigil®, which does not act as a stimulant and so does not produce side effects like anxiety and irritability. Provigil®'s therapeutic effects have been observed in maintenance of wakefulness test research, where patients have tripled their wakefulness.

8. Definition of Hypnagogic
Hypnagogic: Concerning the drowsiness one commonly feels before sleep, the transitional state preceding sleep, and also the hallucinations that may occur at that time.
The original French word "hypnagogique" was derived from Greek roots "hypno-", sleep + "agogos", leading = leading to sleep. In the 19th century "hypnagogique" came across the English Channel and became "hypnagogic."
A closely allied term is "hypnoidal." It means resembling hypnosis and also refers to the subwaking state, the condition intermediate between sleeping and waking.

9. narcolepsy

hypnopompic imagery hypnic jerk chronic sleep starts sleep-wake transition disorders