Irregular sleep schedules linked to higher anxiety, depression, loneliness in 23,000-person study

A UCSF/UCSD study of ~23,000 people finds that day-to-day variability in sleep timing is associated with more pronounced anxiety, depression, and loneliness, independent of sleep duration and quality. The finding suggests sleep regularity is a distinct mental-health factor, though causality and clinical significance remain uncertain. This adds to a growing body of evidence on circadian rhythm and mental health, potentially informing future interventions.

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