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

What if we didn't need sleep to dream? Well, scientists may have found a way to hack those benefits even when you're awake.

The term REM was coined by researchers in the 1950s to describe the movements our eyes make while we're in this stage of sleep, which is now understood to be when our most vivid dreaming occurs.

Ahead, we’re diving into all things REM sleep vs deep sleep for Sleep Awareness Week 2025 — including what happens during each stage, when they occur, how much of each we need. Plus ...