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Dr. Bob is Robert Hsiung, MD,
bob@dr-bob.orgShown: posts 1 to 2 of 2. This is the beginning of the thread.
Posted by gazo on April 8, 2007, at 7:42:53
i figured you might appreciate this:
Stage 1, with near-disappearance of the alpha waves seen in awake states, and appearance for the first time of theta waves. (Alpha waves have a frequency of 8-13 Hz (cycles/second). Theta waves have a frequency of 4-7 Hz.) Stage 1 is sometimes referred to as somnolence, or "drowsy sleep". It appears at sleep onset (as it is mostly a transition state into Stage 2) and is associated with the sudden twitches or hypnic jerks many people experience when falling asleep. While these are normal and of no concern, the hypnagogic hallucinations which some people may experience at this stage can be more troublesome. During this period, the subject loses some muscle tone, and conscious awareness of the external environment: Stage 1 can be thought of as a gateway state between wake and sleep.o Stage 2, with "sleep spindles" (12–16 Hz) and "K-complexes." The EMG lowers, and conscious awareness of the external environment disappears. This occupies 45–55% of total sleep.
o Stage 3, with delta waves, also called delta rhythms (.5–4 Hz), is considered part of slow-wave sleep (SWS) and functions primarily as a transition into stage four. Overall it occupies 3–8% of total sleep time.
o Stage 4 is true delta sleep. It predominates the first third of the night and accounts for 10–15% of total sleep time. This is often described as the deepest stage of sleep; it is exceedingly difficult to wake a subject in this state. This is the stage in which night terrors, bed wetting, sleepwalking, and sleep-talking occur.
* REM sleep is popularly associated with dreaming, especially bizarre, visual, and seemingly random dreams; however, dreams can also occur during sleep onset (hypnogogia) and during all other stages of sleep.[4] REM sleep is predominant in the final third of a sleep period; its timing is linked to circadian rhythm and body temperature. The EEG in this period is aroused and looks similar to stage 1, and sometimes includes beta waves. Also known as Stage 5 sleep.
* Active Sleep is a phase of sleep in neonates that appears similar to Rapid Eye Movement (REM) sleep in adults. While it depends on age, neonatal sleep is sometimes scored as Active Sleep, Quiet Sleep, and Wake. This is less specific than the classification of adult's sleep, and is often based on behavioral criteria due to the technical difficulties arising from recording EEG from the neonate.
Scientists are divided on the precise relation between Active Sleep and REM sleep. Some suggest that they are similar, while others say it is an entirely different state
Posted by Phillipa on April 8, 2007, at 12:26:03
In reply to Honore... Sleep, posted by gazo on April 8, 2007, at 7:42:53
Well I'm not Honore but does this mean that the twitching that happens when I start to sleep is stage one and why a cold temp necessary to sleep. Any correlation? Thanks Phillipa
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