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Effects of time of night and sleep stage on perception of sleep in subjects with sleep state misperception

Year: 1998
Type: article
Abstract: Although previous studies have documented that some persons who complain of poor sleep report having been awake when questioned following an awakening from Stage 2 sleep induced by an auditory stimulus, such observations have been confined to the first NREM-REM cycle. We have examined the possibility that the perception of having been awake or asleep may differ across the night. Eight subjects with sleep state misperception were awakened by a 500-Hz tone of progressive amplitude at five time points and were then asked to report whether they believed themselves to have been awake or asleep. This procedure was carried out on an early night during the first sleep cycle, and on a late night during the third sleep cycle, in random sequence. During the early Stage 2 trial, subjects were more likely to report having been awake, whereas in the late Stage 2 trial, they were more likely to report that they had been asleep. Conversely, in the REM sleep trial on the early night, subjects were more likely to report that they had been asleep. On the late night they were more likely to report that they had been awake, a change which was paralleled by a significant drop in scores on the Foulkes Dream Complexity Scale. Calculation of the duration of uninterrupted sleep prior to the trials suggests that this may have been a factor in the Stage 2, but not the REM, findings. There were no significant differences between the early and late REM trials in the frequency of dream reports, quality of dreams, or fragmentation of REM. These data indicate that subjects with sleep state misperception may experience REM sleep very differently in the first and third NREM-REM cycles.
DOI: 10.3758/bf03330594
Language: English
Open Access status: diamond
OpenAlex ID: W794354941
FWCI: 0.204
Cites: 15
Cited by: 11
Related to: 10