Stutz J, et al. - Researchers examined the impact of evening exercise on sleep, and assessed whether variables such as exercise intensity or duration modify the response. The investigators performed a systematic search of PubMed, Cochrane, EMBASE, PsycINFO, and CINAHL databases to identify relevant studied, and included those that assessed sleep after a single session of evening physical exercise vs a no-exercise control in healthy adults. Findings did not support the premise that evening exercise negatively affects sleep—in fact, results suggested the opposite. In addition, the researchers found that vigorous exercise ending ≤ 1 hour before bedtime might impair sleep-onset latency, total sleep time, and sleep efficiency (SE). Results also showed that running was related to less wake after sleep onset (WASO) vs cycling. Overall, findings suggested an association of a higher level of physical stress with lower SE and more WASO.