Not getting enough deep, non-REM sleep inhibits production of growth hormone, which might lead to premature middle-age symptoms—abdominal obesity, reduced muscle mass and strength, and diminished exercise capacity. You become Homer.

Fix your head: “Mentally disengage yourself before you hit the sack,” says Jim Karas, author of The Business Plan for Your Body. Don’t plot a staffing reorg before bed.

Fix your routine: Exercise in the morning or afternoon, says Eric Nofzinger, M.D., director of sleep neuroimaging research at the Western Psychiatric Institute. Evening workouts may leave you too stimulated to sleep. Establish a ritual that signals your body that the day is over 30 minutes before bedtime—turn off the computer, read, stretch, or set the TV volume low, says Karas.

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