Late bedtime and wake time are associated with lower
moderate-to-vigorous PA (MVPA) levels compared to earlier sleep
timing in children/adolescents [7]. The timing of the sleep episode
may be an important determinant of energy balance [8]. Therefore,
we aimed to determine the relationship between sleep timing
and quality and PA levels, under habitual conditions in adults. We
hypothesized that later sleep timing, worsened sleep quality, and
greater daytime somnolence would be associated with less vigorous
and more sedentary PA levels.