Here's a source to explain what i'm talking about.

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Posted by August ( on July 08, 2000 at 19:53:18:

In Reply to: Night terrors? posted by Doug L on July 08, 2000 at 18:53:56:

I pasted this as a very basic reference plus a site that will explain what I'm talking about.
Basically what I'm asking is: Does anyone else have this sleeping disorder? After we talked about sleep apnea which is a sleeping disorder, it hit me that maybe this might tie in as well. If you have this sleeping disorder, it usually occurs about an hour into sleep. For me that is also about the time frame of when I get hit with a cluster.

Night Terror or Nightmare?: Nightmares occur during the dream phase of sleep known as REM sleep. Most people enter the REM stage of sleep sometime after 90 minutes of sleep. The circumstances of the nightmare will frighten the sleeper,who usually will wake up with a vivid memory of a long movie-like dream. Night terrors, on the other hand, occur during a phase of deep non-REM sleep usually within an hour after the subject goes to bed. This is also known as stage 4. (A link to a sleep stages chart can be found on the navigation bar to the left) During a night terror,which may last anywhere from five to twenty minutes, the person is still asleep. The sleepers eyes may be open, but they are not awake. When the subject does wake up, the subject usually has no recollection of the episode other than a sense of fear. This however is not always the case. Quite a few people interviewed can remember portions of the night terror, some remember the whole thing.

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