00:01 Hi there! Let’s do sleep. 00:05 The stages of sleep are defined by the following EEG characteristics, electroencephalogram. 00:13 Defined as REM versus non-REM and I’ll give you the details as to what exactly that encompasses. 00:20 Typically, cycle in an orderly fashion over a 90-minute period. 00:25 Four to six cycles per night in young adults. 00:29 And REM density decreases as we age, unfortunately. 00:34 Stage 2 density increases to replace the REM as we age. 00:40 Let’s take a look at all of this in greater depth. 00:44 Here, we’ll take a look at non-REM cycle sleeps and their respective stages. 00:49 Stage 1, loss of posterior alpha rhythm on EEG, typically a brief transition stage. 00:56 So stage 1, brief. 00:59 Stage 2: You have sleep spindles and K-complexes on EEG. 01:06 Make up the majority of your sleep in adults, stage 2. 01:10 And as I was telling you earlier, remember that REM starts diminishing as we get older, replaced usually by stage 2 more so. 01:17 K-complexes. 01:19 Stage 3 will be 20 to 50% of EEG and delta activity. 01:25 And what that means to you on your EEG is 4 hertz or less. 01:31 Remember, all characterized by reduced but present muscle tone and regular, slow respirations. 01:39 REM sleep is what’s next. 01:43 The EEG very much looks similar to that of wakefulness. 01:48 Rapid eye movement is what REM stands for, horizontal in fashion. 01:54 Irregular respirations, loss of skeletal muscle tone, except for the eyes and larynx. 02:02 It has to, so you can breathe and so that you can have the rapid eye horizontal movements. 02:07 Vivid dreams.
The lecture Sleep Stages by Carlo Raj, MD is from the course Sleep. It contains the following chapters:
Density in which of the following stages increases to replace REM sleep as we age?
When do K-complexes occur during sleep?
Vivid dreams are more likely to occur in which of the following stages?
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Es una muy buena clase, el tema se entiende muy bien.