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

Not spending enough time in the two deep stages of sleep may hasten the deterioration of parts of the brain associated with Alzheimer's disease.

It makes sense that getting quality deep and REM sleep is key to our ability to function.Adults need about seven to eight hours of sleep to be healthy, while teens and younger children need much more.

while babies need much more — in fact, infants can spend about 50% of their sleep in REM. To make matters worse, deeper stages of sleep decrease as you age, Cho said. Deep sleep tends to come ...

Spending lower proportions of time in two deep sleep stages — including REM sleep — may be linked to volume changes in ...

If you’re struggling with sleep due to taking beta blockers, he says that taking between 2.5 to three milligrams is typical.