Does late morning waking-up affect sleep during the following night in patients with primary insomnia?

Atsushi Ogawa, Shiro Hinotsu, Koji Kawakami

Research output: Contribution to journalArticle


Night-to-night variability in sleep duration and schedule is common in patients with insomnia. Among the various sleep variables, waking-up time is focused upon as the important factor for cognitive behavioural therapy for insomnia. This study examined the effect of a single late waking-up episode on sleep in the immediate following night in patients with chronic insomnia, using data from a placebo group (380 patients) of a double-blind placebo-controlled study. Patients tended to wake up later and have a longer total sleep time on weekends than weekdays. It was suggested that patients who woke up late one morning (later than the individuals regular waking-up time) extended their sleep onset latency by 4.3 min in the immediate following night. The effects of late waking-up on total sleep time and bedtime were not clear. The importance of keeping regular waking-up time is highlighted for better sleep in patients with insomnia.

Original languageEnglish
Pages (from-to)938-948
Number of pages11
JournalBiological Rhythm Research
Issue number6
Publication statusPublished - Dec 1 2013



  • insomnia
  • irregular sleep
  • sleep onset latency
  • waking-up time
  • weekend

ASJC Scopus subject areas

  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Physiology (medical)

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