Walkerrar — Why We Sleep By Matthew

Sleep loss keeps the "fight-or-flight" system in overdrive, leading to higher blood pressure and increased risks of heart attack and stroke.

Sleep is not a uniform state but a complex cycle of two main stages that serve distinct functions: Why We Sleep by Matthew Walkerrar

Occurs primarily in the first half of the night. It serves as a "sensory blackout," during which the brain moves information from short-term to long-term storage and clears out "mental trash". Sleep loss keeps the "fight-or-flight" system in overdrive,

Matthew Walker’s Why We Sleep argues that sleep is a critical biological necessity, not a luxury, influencing every major system in the body and brain. Walker, a professor of neuroscience, emphasizes that routinely getting less than 7–9 hours of sleep leads to severe cognitive impairment and life-threatening health risks. not a luxury