Sleep disorders can affect people of any age. Delayed sleep-wake phase disorder, restless legs syndrome, and insomnia are a few examples of disorders that may disrupt sleep cycles in teens. Sleep-wake ...

Past age 50, men are much more likely to have REM sleep behavior disorder than women. Jose Luis Pelaez/Stone via Getty Images Every night, you go through four to five sleep cycles. Each cycle, lasting ...

A 2023 study found that shorter sleep duration causes reduced brain cortical thickness. Sleep disorders increase the risk of Alzheimer’s, stroke, and cognitive decline. Chronic sleep deprivation ...

Learn facts about sleep, during which the body rests, recuperates and performs essential repairs. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.