Browsing: Waves

https://p.dw.com/p/5HSez Europeans experiencing relentless summer heat installed mobile air conditioners to aid sleep on hot nightsImage: He Canling/Xinhua/IMAGO

Each night, your sleep comes in stages: After you drift off, you slip from light sleep into the deepest, most restorative type of sleep, and your brain waves hit their slowest point. About an hour later, your brain waves pick back up again in REM sleep, and that’s when your dreams might start to get…