Topics: Sleep, Exercise, Cortisol Pages: 3 (522 words) Published: May 18, 2014
Can exercising at night hurt your sleep?
The rumor: Exercising at night can interfere with a good night's sleep Maybe you're the kind of person who likes to lift weights while watching "Late Night With Jimmy Fallon," go running in the park at 10 p.m. or practice Pilates after you've digested your dinner. If so, you've no doubt heard the rumblings that exercising at night is baaaad for your sleep. After all, exercising raises your core body temperature, increases your heart rate and prompts your system to release stimulating epinephrine (adrenaline). While those are normally desirable outcomes (they're kind of the reason you work out in the first place), popular wisdom says that at night, the effects of physical exertion can keep you up hooting with the owls.

The question is: Is this true, or is it just a myth invented by people who are looking for an excuse to bail on their after work workout? The verdict: For the most part, exercising at any time of day will help you sleep There is anecdotal evidence that some people have difficulty falling asleep after vigorous bouts of late-night exercise -- and Dr. Stuart Quan, the Gerald E. McGinnis professor of sleep medicine at Harvard Medical School and editor-in-chief of, acknowledges that these individuals should be wary of working out too close to bedtime. "Their adrenaline is high, their brain is active, and it's difficult to wind down," he says. If you fall into that group and have experienced trouble sleeping after a midnight-hour cardio workout or yoga session, Quan recommends that you give yourself a few hours between workout time and sleepy time. This strategy will allow your body temperature to return to its usual 98.6 degrees, your heartbeat to return to its resting rate and your adrenaline levels to stabilize so you can get your Z's. For most people, however, exercising close to bedtime doesn't appear to adversely affect sleep quality in the slightest. A 2011 study...
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