What question did this study set out to answer?

To compare extreme circadian preferences by examining 24-hour motor activity and rest-activity rhythms in a naturalistic environment.

September 18, 2026Journal of Sleep ResearchOpen Access

Rhythmic Characterisation of Extreme Circadian Preferences in Everyday Life

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Authors

LTLorenzo TonettiUniversity of Bologna FGFederica GiudettiGNA University EREdoardo Maria RossiUniversity of Bologna

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Implication

Observational study demonstrates distinct circadian and ultradian phase differences between morning and evening chronotypes, indicating altered environmental synchronization.

Key Points

To compare extreme circadian preferences by examining 24-hour motor activity and rest-activity rhythms in a naturalistic environment.
Assessed 84 participants (64 females, 20 males; mean age 23.3 ± 4.2 years) classified into 42 evening types and 42 morning types.
Participants wore a non-dominant wrist actigraph continuously for 1 week to collect minute-by-minute activity counts.
Evaluated qualitative and quantitative sleep features, functional linear modelling (FLM) for circadian profiles, and Locomotor Inactivity During Sleep (LIDS) for nocturnal ultradian dynamics.
No statistically significant differences were detected in general sleep features or across several overall circadian and ultradian rhythmicity parameters between chronotypes.
All evaluated indicators of circadian and ultradian phases showed significant differences between groups.
Morning types exhibited a significantly steeper rate of decline in nocturnal locomotor inactivity (LIDS) compared to evening types.

Cite This Study

Tonetti et al. (2026) studied this question.

synapsesocial.com/papers/6aad0bb6de0393d728b8a1f1 https://doi.org/10.1111/jsr.70461

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Implication

Observational study demonstrates distinct circadian and ultradian phase differences between morning and evening chronotypes, indicating altered environmental synchronization.

Rhythmic Characterisation of Extreme Circadian Preferences in Everyday Life

Discussion

Member takes

Implication

Key Points

Cite This Study

Rhythmic Characterisation of Extreme Circadian Preferences in Everyday Life

Discussion

Member takes

Implication

Key Points

Cite This Study

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