Why We Sleep By Matthew Walkerrar Apr 2026

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.

Chronic lack of sleep is a key risk factor for Alzheimer’s disease as it prevents the brain from clearing toxic amyloid proteins. Why We Sleep by Matthew Walkerrar

Driving while sleep-deprived can be as dangerous as driving drunk; being awake for 22 hours results in the same level of cognitive impairment as legal intoxication. Practical Tips for Better Sleep Matthew Walker’s Why We Sleep argues that sleep

Occurs more frequently in the second half of the night. This stage is essential for "emotional first aid," helping to process traumatic events and foster creative problem-solving by making novel neural connections. Critical Health Impacts of Sleep Deprivation Driving while sleep-deprived can be as dangerous as

Short sleep makes fat cells less responsive to insulin, which can lead to pre-diabetic blood sugar levels within just one week of moderate deprivation.

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".