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Stage 4 - differentiate between REM and Stage 1 or wake We...

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Stage 4 - This stage is sometimes considered that "true" slow wave sleep stage. We spend approximately 13% of our sleeping time in Stage 4. The sleeper has definitely entered Stage 4 when there are more than 50% delta waves. Many people believe that we dream only in REM sleep (in fact, some people refer to REM as the dreaming stage. While it is true we have most of our dreams during REM, we also dream in SWS) * Note -- NREM sleep is considered inactive sleep, because during these stages, we have decreased Blood Pressure, decreased Heart Rate (measured with ECG), reduced muscle tension (measured with EMG), and slower eye movements (measured with EOG). REM: Occurs in regular intervals every 60-90 minutes. REM sleep has its own unique pattern of brain waves. The waves look much like the teeth of a saw (means that the waves are fast and close together) and the pattern looks almost identical to stage 1 or wake. How then can we
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Unformatted text preview: differentiate between REM and Stage 1 or wake? We rely on the other measures - during REM, muscle activity drops to almost nothing. In fact, did you know that you are virtually paralyzed during REM? It's true. There are many theories about why this is so, but regardless of why we are, the fact is that we are. In addition, eye movements become more frequent and, instead of occurring a slow rolling fashion like in other stages, they are more sharp and occur in a fast, back and forth motion. REM cycle length seems to be dependent on brain size: rats = approx every 12 minutes. Also humans have approx twice the amount of REM as other species. a) dreaming- mostly occurs in REM, approximately 80%, although, as mentioned, we do dream in SWS. b) age- amount of REM decreases with age....
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