Abstract
Sleep states, the power spectra of the cortical electroencephalogram (EEG) and cortical temperature (T crt) were determined in young rats (age 23–24 days). Recordings were made for 1 day under habitual 12 h light: 12 h dark (LD 12∶12) conditions and on the subsequent day under continuous darkness (DD). The amount and distribution of the vigilance states differed little between experimental conditions. Sleep occurred predominantly during the actual (LD) or habitual (DD) 12-h light period. The EEG power density in the actual light period was lower than in the habitual light period. These differences were largest in the delta range for the EEG of non-rapid eye movement of sleep (NREMS) and in the theta range for the EEG of REM sleep (REMS) and waking. EEG power density in NREMS was somewhat lower in the LD dark period than in the corresponding DD period. The typical 24-h pattern of EEG power density in NREMS, which reflects processes underlying sleep regulation, was little affected by the experimental conditions. It is concluded that the light during an LD 12∶12 schedule suppresses the EEG but has little effect on the vigilance states.
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Alföldi P, Tobler I, Borbély AA (1990) Sleep regulation in rats during early development. Am J Physiol 258:R634-R644
Borbély AA (1978) Effects of light on sleep and activity rhythms. Prog Neurobiol 10:1–31
Borbély AA, Neuhaus HU (1979) Sleep-deprivation: effects on sleep and EEG in the rat. J Comp Physiol [A] 133:71–87
Borbély AA, Tobler I, Hanagasioglu M (1984) Effect of sleep deprivation on sleep and EEG power spectra in the rat. Behav Brain Res 14:171–182
Friedman L, Bergmann BM, Rechtschaffen A (1979) Effects of sleep deprivation on sleepiness, sleep intensity, and subsequent sleep in the rat. Sleep 1:369–391
Ibuka N (1984) Ontogenesis of circadian sleep-wakefulness rhythms and developmental changes of sleep in the altricial rat and in the precocial guinea pig. Behav Brain Res 11:185–196
Jouvet-Mounier D, Astic L (1968) Etude de l'évolution du sommeil du raton au cours du premier mois post natal. C R Soc Biol (Paris) 162:1453–1457
Obál F Jr, Rubicsek G, Alföldi P, Sáry G, Obál F (1985) Changes in the brain and core temperatures in relation to the various arousal states in rats in the light and dark periods of the day. Pflügers Arch 404:73–79
Rosenberg RS, Bergmann BM, Rechtschaffen A (1976) Variations in slow wave activity during sleep in the rat. Physiol Behav 17:931–938
Tobler I, Borbély AA (1986) Sleep EEG in the rat as a function of prior waking. Electroencephalogr Clin Neurophysiol 64:74–76
Tobler I, Borbély AA (1990) The effect of 3-h and 6-h sleep deprivation on sleep and EEG spectra of the rat. Behav Brain Res 36:73–78
Trachsel L, Tobler I, Borbély AA (1986) Sleep regulation in rats: effect of sleep deprivation, light, and circadian phase. Am J Physiol 251:R1037-R1044
Trachsel L, Tobler I, Borbély AA (1988) Electroencephalogram analysis of non-rapid eye movement sleep in rats. Am J Physiol 255:R27-R37
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Alföldi, P., Tobler, I. & Borbély, A.A. The effect of light on sleep and the EEG of young rats. Pflugers Arch. 417, 398–403 (1990). https://doi.org/10.1007/BF00370659
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DOI: https://doi.org/10.1007/BF00370659