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Intrusion of alpha activity, an electroencephalographic (EEG) pattern typical for
wakefulness, into sleep stages has repeatedly been described and investigated in various
populations. Some studies suggested that it is a less deep and restorative sleep,
but others did not support this interpretation. The present study was carried out
to collect ample data on neurophysiology and subjective experience of sleep and on
daytime cognitive performance to clarify this point. A sample of 128 primary insomniacs
was investigated with polysomnography (PSG) that was submitted to a computerized,
automatic analysis of alpha activity during sleep. It yielded two groups of 64 Ss
each with a normal, that is, nonalpha sleep EEG and with alpha-sleep, respectively.
Contrasting the two groups for PSG showed that alpha sleep Ss had significantly more
stage 4 and a (nonsignificant) tendency for more awakenings. Subjectively, they largely
underestimated intermittent wake time and consequently overestimated sleep duration
by 50 min. The performance test battery showed a difference in one test only, that
is, a better short-term memory function by alpha sleep Ss. In conclusion, there was
no result supporting the assumption that alpha sleep is less restorative, but a significant
lack of perception of intermittent awakenings during night sleep by alpha sleep Ss
was found. The authors propose an explanation and point to the implications this misperception
might have for the clinician.
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Article info
Publication history
Received in revised form:
May 25,
1994
Received:
April 28,
1994
Identification
Copyright
© 1995 Society of Biological Psychiatry. Published by Elsevier Inc.