Every night, a wolf lies paralyzed in its den, eyes darting beneath closed lids. A migrating godwit sleeps mid-flight, its brain processing magnetic fields while its body soars 30,000 feet above the Pacific
Your cat twitches on the couch, paws running through phantom hunts.
Nature's most dangerous gamble unfolds in darkness, and we've been getting it wrong for centuries
Welcome to the evolutionary scandal that shouldn't exist: REM sleep