Effects of Melatonin Supplementation on Renal Physiology in a Habitual Sleep Restricted Population.

In a 6 week pilot study, 20 individuals with habitual sleep restriction will all be asked to extend their nightly sleep by 1 hour, and will then be randomized 1:1 to nightly controlled-release oral melatonin (2mg) or placebo. The investigators will assess whether sleep extension and nightly melatonin supplementation in the community is a feasible intervention with a beneficial effect on the following chronic kidney disease (CKD) risk factors: systemic and renal specific renin-aldosterone-angiotensin system (RAAS) activation (systemic plasma renin activity, plasma angiotensin II levels, 24-hour urine aldosterone excretion, and renal plasma flow response to captopril); nocturnal blood pressure measured by 24-hour ambulatory blood pressure monitor; central blood pressure measured by pulse wave analysis; and glucose metabolism measured by Minimal Model assessment of insulin resistance and β-cell response to a mixed meal protocol.