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REM and NREM

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chubz90:
can some one please clear this up for me. NREM occurs in all four stages where as the REM occurs after about 60 minutes when you have progressed back to the start- after the first cycle.Am i on the right track? im just a little confused, any help would be great

moshi:
what do you mean by all four stages?
do you mean the cycles of sleep?
but other than that, you're right in saying that REM occurs approximately an hour after you fall asleep

daniel99:
OKAY so there are two categories of sleep NREM (non rapid eye movement) and REM (rapid eye movement)

NREM can be categorised by four stages:
Stage 1
Stage 2
Stage 3
Stage 4

REM (can be classed as a 5th stage however it is its own stage, so dont refer to it as that, its just so you know that REM occurs after NREM e.g. Stage 1-4 NREM and then stage 5 REM) Hope that doesnt confuse you!!! it confused me at first!

The sleep cycle last for apprx 90 mines...First of all you have one cycle of NREM and then another cycle of NREM and then you have a cycle of REM...

As the night progresses the periods of REM stage sleep last longer and NREM period of sleep decrease..

Hope that helps

daniel99:
These are my notes on dot point 4: which is what your referring to:

Awake EEG: beta waves: high F, low A

NREM Stage 1 (drowsy)EEG: alpha waves: mid-high F, mid-low AEMG: Reduction in muscle tension (but muscles still active)
   Other sign: hypnic jerk
   EOG: May be slow, rolling movements

NREM Stage 2 (light sleep)EEG: theta waves = low F, mixed A. Sleep spindles (burst of high F)K complexes (burst of high A).EMG: Medium ActivityEOG: No movement

NREM Stage 3 (sleep)EEG: theta & delta waves = higher A, lower FEMG: Medium or Low AEOG: No movement

NREM Stage 4 (deep sleep)EEG: delta waves = high A, low FEMG: Medium or Low AEOG: No movement

REM (Rapid Eye Movement)EEG: Beta waves: irregular bursts of high F, low AEMG: Low A (temporary paralysis)
EOG: Sharp, intermittent eye movements

Sleep cycles of 90mins through night.
NREM stage 1 to 4, then back, then REM.
More time in NREM at start of night
More time in REM later in night

chubz90:
the insert quote button is not working??

anyway, Daniel you are THE man. Thanks, i think i get it now  ;D

just one thing, i think you have to also know the actual frequency, as in Mhz. Anyway, again thanks a bunch.  ;)

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