HOUSTON — A good night’s sleep is important for both the body and brain. It’s essential to understand the four stages of sleep and how to get more restful z’s. Stage 1: Transitional sleep The sleep ...

Stages of sleep explained in clear terms, showing how sleep unfolds through the night and why order, timing, and consistency ...

Deep sleep refers to slow-wave sleep — a stage in the sleep cycle when brain waves slow down. Getting enough deep sleep is crucial for numerous bodily functions. But how to increase deep sleep isn’t ...

Light sleep is the beginning of your sleep cycle and your body's way of winding down. Breathing, heart rate and muscle changes prepare your body for the deeper sleep to come. Light sleep is broken ...

Everything you need to know about REM sleep, including what it is and how much you need ...