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A Study of Insomnia and Sleep Loss
Author Bio
Introduction
Secondary Insomnia
Primary Insomnia
Measuring Insomnia
Physiological Measurements
Standard Scoring Protocols
Currently selected section: Exercise A
Exercise B
PSG Assessment
Part II
Part III
 
 
 
 


Chapter 15: Challenges to the Study of Insomnia and Sleep Loss: Exercise A
        

Considering this information on PSG sleep stages, look at the following segments of PSG records in Figures 1.7.1a, 1.7.1b and 1.7.1c (Source: Rechtschaffen A, Kales A. A manual of standardized terminology, techniques and scoring systems for sleep stages of human subjects. National Institutes of Health publication No. 204. Bethesda, MD: National Institute of Neurological Disease and Blindness; 1968.) for a healthy young man who has a nighttime PSG recording done in the sleep center laboratory. In each figure, the top one or two tracings (C3-A2, O1-A2) show EEG brainwaves, the middle two channels show eye movements (EOG) and the bottom trace shows muscle tension (EMG).

Click on the figures for larger view.
Figure 1.7.1a: This figure shows tracings consistent with deep sleep, or stage 4 [i.e., more than 50% of the epoch (30 sec segment) with high amplitude delta waves]. The recording segment shows that (delta) wave activity is prominent in central EEG channel (C3-A2) and also in other channels including occulographic channels.Figure 1.7.1b: This figure shows tracings consistent with light sleep, or stage 2. The EEG recording segment shows K complexes and sleep spindles and the absence of slow wave (delta) activity. K complexes can occur with sudden stimuli or in the absence of detectable input.
Figure 1.7.1c: This figure shows tracings consistent with REM sleep. Eye movements are seen on the occulogram channels. Bottom EEG channel shows a train of sawtooth theta activity. The electromyogram shows near absence of muscle tension activity.

Question 1.7.1

Which set of tracings represent light sleep (stage 2)?

Selection A Figure 1.7.1a
Selection B Figure 1.7.1b
Selection C Figure 1.7.1c

Question 1.7.2

Which set of tracings represent deep or slow wave sleep (stage 4)?

Selection A Figure 1.7.1a
Selection B Figure 1.7.1b
Selection C Figure 1.7.1c


Question 1.7.3

Which set of tracings represent REM sleep?

Selection AFigure 1.7.1a
Selection BFigure 1.7.1b
Selection CFigure 1.7.1c

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