Traditional alarm clocks wake you up at a specific time regardless of what stage of sleep you're in. Sleep Cycle can wake you up when you're in your lightest sleep stage. Having used Sleep Cycle for ...

How sleeping in 90 minute blocks has helped me get rid of morning grogginess.

Non-24-hour sleep-wake disorder (N24SWD) occurs when your sleep-wake cycle gradually shifts out of sync with the 24-hour day. It affects about half of blind people, but it can also affect those with ...

Sleep regularity (waking up and going to bed at the same time every day) could be more important than sleep duration in predicting heart attack and stroke. A new study found that even when individuals ...

Share on Pinterest A new study found an increased risk of cardiovascular events in people with irregular sleep patterns. nong2/Getty Images Sleep regularity (waking up and going to bed at the same ...