But how do sleep cycles work? To find out, I took part in a polysomnography. This is a gold standard sleep study that helps ...
"Deep sleep builds your immune system, and REM sleep regulates and fine-tunes it," says Darwall-Smith agrees. During deep ...
and stage 3 — also known as delta sleep or deep sleep — is 10–40 minutes. REM sleep — when we dream — can last anywhere from 10 to 60 minutes. Though that obviously means the length of ...