Lack of light may upset your sleep-wake cycle and other circadian rhythms.

Learn how to hit the sweet spot in your sleep-wake cycle.

This routine will put your brain and body on a healthy sleep-wake cycle.

This keeps your body programmed with a predictable sleep-wake cycle.

Those are daily rhythms such as your sleep-wake cycle.

Getting enough sleep and keeping a regular sleep-wake cycle.

It gives a gross picture of sleep-wake cycles and is often used to verify the sleep diary.

When the sleep-wake cycle goes awry, it affects the whole body.

Cancer patients are at great risk for developing insomnia and disorders of the sleep-wake cycle.

They may experience sleep-wake cycles, or be in a state of chronic wakefulness.