REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

Another key psychological mechanism contributing to sleep procrastination is delay discounting; the favouring of immediate ...

"As part of the circadian rhythm (which regulates sleep-wake cycles among other things), the body's core temperature naturally decreases at night, signaling that it's time to sleep," she said.

This is the body's 24-hour sleep-wake cycle. It naturally responds to light and darkness, and it dictates when we get hungry, sleepy and ready to wake up. Think of it as an internal clock.

Sleep quality matters more than quantity. Learn why you might still feel tired despite getting eight hours of sleep and how ...

Sunlight plays a huge role in our energy levels and sleep quality. One study found that those who got enough morning sunlight ...

Done wisely, naps can be a valuable way to boost your focus and energy. A sleep researcher explains how to get it right.

While caffeine may help by "reducing sleep inertia", even when these drinks are consumed in the morning, they can still ...

“This will anchor your sleep/wake cycle, called your circadian rhythm.” Your circadian rhythm governs your sleep-wake cycle and plays a key role in regulating hormone release. Sleep ...

In this study, researchers administered psilocin (2 mg/kg) to 18 male laboratory mice and tracked their sleep-wake cycles using brainwave and muscle activity recordings. They observed that ...