Most sleep experts say regular exercise helps us sleep more deeply, but poorly timed workouts can actually disrupt your ability to snooze.
The problem? The process of falling asleep depends, in part, on falling body temperature. But exercise heats us up and keeps our core temperature elevated for 90 minutes or so.
The solution? Most people should exercise at least three hours before going to bed; those prone to insomnia should allow at least a six-hour leeway.