People who sleep late have a harder time maintaining and exercise schedule.
They are more likely to sit around and are more likely to find barriers to exercising.
“Waking up late and being an evening person were related to more time spent sitting, particularly on weekends and with difficulty making time to exercise,” said Kelly Glazer Baron, director of the Behavioural Sleep Medicine Programme at the Feinberg School of Medicine in Chicago.
The study group comprised 123 healthy adults who slept at least six and a half hours a night.
Even those who did exercise found it harder when they woke up lat and “being an evening person made it perceived as more difficult.”
According to Baron, the study suggests that circadian rhythms –body rhythms throughout the day and night – should be taken into consideration as part of exercise recommendations, especially for less active adults.
“Sleep timing should be taken into account when discussing exercise participation,” she added.
“We could expect that sleep timing would play even a larger role in a population that had more difficulty exercising.”
The Centers for Disease Control and Prevention recommends that adults get at last 150 minutes of moderate-intensity aerobic activity every week and participate in muscle-strengthening activities on two or more days a week.
The research is published in an online supplement of the journal Sleep.