the.com/shuteye
the body's free nightly tune-up your brain books while you're not looking.
brain rinseSleep flushes toxins via the glymphatic system
slang originCoined as American slang in the 1890s
micro versionA 20-minute nap sharpens alertness for hours
dolphin trickDolphins sleep one brain hemisphere at a time
deprivation costSkipping it impairs you like being drunk