Circadian rhythms in humans' delta sleep electroencephalogram

Xin Tan, Makoto Uchiyama, Kayo Shibui, Hirokuni Tagaya, Hiroyuki Suzuki, Yuichi Kamei, Kyuja Kim, Sayaka Aritaka, Akiko Ozaki, Kiyohisa Takahashi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Eight healthy young male volunteers entered a 20-40 min ultrashort sleep-wake schedule for 78 h in the time-isolation facility. Rectal temperature was continuously recorded. Sleep electroencephalograms (EEGs) obtained during 20 min nap trials were stored in the computer and later analyzed by fast Fourier transform. A two-way repeated-measures ANOVA (with day and time-of-day as the repeated measures) revealed significant circadian rhythms in the powers of sigma and delta sleep EEGs, and in rectal temperature. These results obtained under conditions in which behavioral confounding factors of retiring and rising were experimentally minimized suggest that the circadian pacemaker contributes to determining the hours of day when one can sleep deeply.

Original languageEnglish
Pages (from-to)205-208
Number of pages4
JournalNeuroscience Letters
Issue number3
Publication statusPublished - 2003 Jul 3


  • Core body temperature
  • Day effect
  • Delta power
  • Time-of-day
  • Ultrashort sleep-wake schedule


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