Numerous studies have demonstrated that a sustained exercise regimen incorporating vigorous weight training can greatly improve sleep quality and the duration of sleep episodes. (simplyshredded.com)
As a result, newborn sleep episodes tend to be brief, and spaced at fairly regular intervals around the clock. (parentingscience.com)
Black bars indicate the 10:00 PM — 6:00 AM sleep episode in darkness. (pnas.org)