Systematic Trends Across the Night in Human Sleep Cycles

Feinberg, Irwin; Floyd, Thomas C.

doi:10.1111/j.1469-8986.1979.tb02991.x

Cited by 351 publications

(193 citation statements)

References 23 publications

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“…Therefore, the entire subject sample was included in the analyses on the second and the third sleep cycles, whereas 22 subjects (15 REC and 7 NREC) were considered for the analyses on the fourth REM sleep episode and 33 subjects (19 REC and 14 NREC) were considered for those on the fourth stage 2 episode. Sleep cycles were defined according to standard criteria (Feinberg and Floyd, 1979). EEG power maps have been computed separately for REM and stage 2 sleep, and statistical comparisons (unpaired t tests) have been performed on log-transformed values between REC and NREC groups, separately for the two sleep stages and for the three sleep cycles.…”

Section: Discussionmentioning

confidence: 99%

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Marzano

Ferrara²,

Mauro³

et al. 2011

J. Neurosci.

121

159

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Under the assumption that dream recall is a peculiar form of declarative memory, we have hypothesized that (1) the encoding of dream contents during sleep should share some electrophysiological mechanisms with the encoding of episodic memories of the awake brain and (2) recalling a dream(s) after awakening from non-rapid eye movement (NREM) and rapid eye movement (REM) sleep should be associated with different brain oscillations. Here, we report that cortical brain oscillations of human sleep are predictive of successful dream recall. In particular, after morning awakening from REM sleep, a higher frontal 5-7 Hz (theta) activity was associated with successful dream recall. This finding mirrors the increase in frontal theta activity during successful encoding of episodic memories in wakefulness. Moreover, in keeping with the different EEG background, a different predictive relationship was found after awakening from stage 2 NREM sleep. Specifically, a lower 8 -12 Hz (alpha) oscillatory activity of the right temporal area was associated with a successful dream recall. These findings provide the first evidence of univocal cortical electroencephalographic correlates of dream recall, suggesting that the neurophysiological mechanisms underlying the encoding and recall of episodic memories may remain the same across different states of consciousness.

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Section: Discussionmentioning

confidence: 99%

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Marzano

Ferrara²,

Mauro³

et al. 2011

J. Neurosci.

121

159

View full text Add to dashboard Cite

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“…The reason was probably that SWE contains a time factor -cycle duration -which did not show any fall across cycles . The pattern of cycle duration is normally one of low values in the first and fifth (last) cycle (22).…”

Section: Discussionmentioning

confidence: 99%

Spectral analysis of sleep electroencephalography in rotating three-shift work.

Akerstedt¹,

Kecklund²,

Knutsson³

1991

Scand J Work Environ Health

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, MD3AKERSTEDT T, KECKLUND G, KNUTSSON A. Spectral analysis of sleep electroencephalography in rotating three-shift work . Scand J Work Environ Health 1991;17:330-6. Fourteen male rotating threeshift workers were subjected to 24-h ambulatory polysomnographic recording in connection with morning, afternoon, and night shift work (at home and at work) . Total sleep time, stage 2, rapid-eye-movement sleep, and slow-wave sleep (stages 3 + 4) were significantly reduced during sleep in connection with the night and morning shifts. Other visually scored sleep parameters and slow-wave energy (spectral power density integrated across sleep) were not affected. The content of the sleep cycles did not differ between shifts. The sleep before the morning shift was characterized by subjectively increased difficulties of sleep initiation and sleep termination, as well as by insufficient recuperation. The night shift was characterized by increased subjective difficulties of maintaining sleep, but also by increased ease of sleep initiation. It was concluded that both morning and evening shifts interfered with sleep, although no effects of sleep deprivation were found .

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“…Four-s epochs with artifacts were identified and eliminated. Consecutive NREM-REMS cycles were defined according to modified criteria of Feinberg and Floyd (1979). NREMS episodes starting with stage 2 and containing at least 15 minutes of the stages 2, 3 and 4 were succeeded by REMS episodes of at least 5 minutes duration.…”

Section: Polygraphic Recordings Heart Rate and Core Body Temperaturementioning

confidence: 99%

Serotonin-2 Receptors and Human Sleep Effect of a Selective Antagonist on EEG Power Spectra

Landolt

Meier

Burgess

et al. 1999

Neuropsychopharmacology

102

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To investigate the effect on the sleep EEG, a 1-mg oral dose of SR 46349B, a novel 5-HTThe pivotal role of serotonin (5-hydroxytryptamine, 5-HT) in sleep regulation has been the mainstay of the monoamine theory of sleep (Jouvet 1972). Although the views about the functions of this neurotransmitter have evolved, there is little doubt about its involvement in sleep mechanisms (McCormick 1992). Serotonergic neurons of the nucleus raphe dorsalis are most active during wakefulness and have been proposed to participate in the build-up of sleep propensity (Adrien 1995). Animal studies revealed that these neurons decrease firing upon transition from wakefulness to nonREM sleep (NREMS), and become quiescent during REM sleep (REMS). Thus, deactivation of the serotonergic system may facilitate the production of NREMS and REMS (Adrien 1995). One of the complexities in accounting for the actions of 5-HT is the large number of different receptors and receptor subtypes. 5-HT receptors are classified into four distinct classes, comprising seven fully characterized functional receptor subtypes and several recombinant receptors (Hoyer and Martin 1996). While the involvement of three main classes (i.e., 5-HT 1 , 5-HT 2 , and 5-HT 3 receptors) in the regulation of sleep and wakefulness has been studied, it is the postsynaptic 5-HT 1A receptor that seems to mediate the inhibition of REMS and the promotion of wakefulness, whereas activation of the 5-HT 2 receptor may exert a tonic inhibition of slow wave sleep (SWS) (see Adrien 1995 for review). In relation to sleep homeostasis, the latter is of particular interest because 5-HT 2 antagonists were shown to increase the amount of SWS and to enhance EEG slow-

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Systematic Trends Across the Night in Human Sleep Cycles

Cited by 351 publications

References 23 publications

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Spectral analysis of sleep electroencephalography in rotating three-shift work.

Serotonin-2 Receptors and Human Sleep Effect of a Selective Antagonist on EEG Power Spectra

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