How sleep, exercise timing, and natural body clock relate in young adults

A total of 909 college students reported significant differences in sleep patterns based on exercise timing and chronotype.

• Evening exercisers had later bedtimes, poorer sleep quality, and lower sleep efficiency than morning exercisers.
• Evening chronotypes experienced greater daytime dysfunction and less positive mood compared to morning or neither chronotypes.
• The relationship between exercise timing and bedtime was influenced by chronotype, with morning-types showing a larger delay in bedtime with later exercise.
• Each minute of delay in exercise timing was associated with a 6.1-minute later bedtime in morning-types and a 3.6-minute later bedtime in evening-types.

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