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

As the days grow longer, extra hours of sunlight can disrupt your body clock and affect melatonin production, increasing the ...

Deep sleep is the restorative stage of sleep. During this stage the body undergoes tissue repair, the immune system is ...

Waking up tired or wired? Your circadian rhythm could be off. Reset your internal clock with science-backed habits for deeper ...

A vast majority of Americans wake up regularly during the night, according to a U.S. News survey. Sleep expert Wendy Troxel ...

We can't talk about morning sunlight and improved sleep hygiene without first addressing our circadian rhythm. This is the ...

Discover 7 delicious nighttime snacks that actually improve sleep quality while satisfying cravings. Learn which foods to ...

April Theory is the notion that this springtime month is perfect for setting goals and making a fresh start. The theory goes ...

Hallucinogens like DMT, psilocin, and LSD might rewrite the rules of sleep, blurring the line between dreams and reality.

Temperature is one of the circadian rhythm's main impetuses, meaning your body's core naturally cools down when it is ...