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See the Light
Want to avoid the afternoon slump? From 1 P.M. to 3 P.M., the body's core temp drops, sparking production of melatonin, which signals the body to sleep. Exposing yourself to direct light—via a walk outside or a blue-light machine—halts the process, says sleep expert Michael Breus.Philips Golite Blu, $150; amazon.com.
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