Diverse Sleep Cycles Animals exhibit remarkably diverse sleep patterns, from dolphins who sleep with half their brain at a time to stay alert for predators, to brown bats who sleep up to 19 hours daily. Elephants require only 2-4 hours of sleep, while koalas spend up to 22 hours sleeping to conserve energy from their low-calorie eucalyptus diet. These variations are evolutionary ad... https://shutdown123.com/