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University of Bergen
Bergen Sleep and Chronobiology Network

Population studies on sleep

The projects focus mainly on various sleep- and circadian rhythm-related questions in the Norwegian population,however surveys will also be conducted internationally. Data collection is carried out through various research agencies and by invitation through Norwegian media such as newspapers and TV. Among other things, different bedroom habits, Norwegians' attitudes towards daylight saving time, insomnia, the relationship between sexual activity and sleep, and sleep health have been examined. We have also collected data and initiated analyses of phenomena such as the use of sleep apps, "bedtime procrastination," and orthosomnia.

Main content

Publications so far:

  1. Bjorvatn B, Waage S, Pallesen S. The association between insomnia and bedroom habits and bedroom characteristics. An exploratory cross-sectional study of a representative sample of adults. Sleep Health 2018; 4: 188-193.
  2. Bjorvatn, B, Saxvig IW, Waage S, Pallesen S. Self-reported seasonality is strongly associated with chronotype and weakly associated with latitude. Chronobiology International 2020 Nov 29;1-8.
  3. Pallesen, S., Waage, S., Thun, E. Andreassen CS, Bjorvatn B. A national survey on how sexual activity is perceived to be associated with sleep. Sleep and Biological Rhythms 2020; 18: 65-72. https://doi.org/10.1007/s41105-019-00246-9.
  4. Bjorvatn B, Saxvig IW, Waage S, Pallesen S. Self-reported seasonality is strongly associated with chronotype and weakly associated with latitude. Chronobiol Int. 2021 Feb;38(2):278-285.
  5. Bjorvatn B, Pallesen S, Saxvig IW, Waage S. Daylight Saving Time preferences in Norway: Do individual chronotype and home address' latitude and longitude matter? Chronobiol Int. 2021 May 25:1-11.
  6. Bjorvatn B, Waage S, Saxvig IW. Do people use methods or tricks to fall asleep? A comparison between people with and without chronic insomnia. Journal Sleep Research 2022; Oct 31:e13763.
  7. Saxvig IW, Bjorvatn B, Waage S. Habitual Sleep Patterns and Chronic Sleep Problems in Relation to Sex, Age, and Circadian Preference in a Population-Based Sample of Norwegian Adults. Clocks Sleep. 2023 Jan 6;5(1):21-33.
  8. Bjorvatn B, Waage S, Pallesen S, Buysse DJ, Saxvig IW. The association between different sleep health dimensions and sex, age, education, circadian preference, and chronic insomnia: A representative population-based study. Sleep Advances 2023; 4(1): zpad041. doi: 10.1093/sleepadvances/zpad041.  PMID: 37954092
  9. Bjorvatn B, Waage S, Saxvig IW. Do people use methods or tricks to fall asleep? A comparison between people with and without chronic insomnia. Journal of Sleep Research 2023; 32: e13763. doi: 10.1111/jsr.13763. PMID: 36316962

Project period

2017-2028

Project group

Bjørn Bjorvatn (project leader)

Ståle Pallesen

Ingvild West Saxvig

Siri Waage

21.02.2024