Why — We Sleep By Matthew Walkerrar

Sleep is not a uniform state but a complex cycle of two main stages that serve distinct functions:

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 Why We Sleep by Matthew Walkerrar

Walker highlights that missing even a small amount of sleep can have "dire" consequences: Sleep is not a uniform state but a

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. Matthew Walker’s Why We Sleep argues that sleep

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.

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