Emotion general Quote

Sleep recalibrates our immune system, fine-tunes our metabolism, and balances our emotions - Matthew Walker
This quote means that sleep isn't a passive state of shutting down. It's an incredibly active period of biological regulation and repair that is absolutely essential for our physical and mental health.

Disease Quote

Routinely sleeping less than six or seven hours a night demolishes your immune system - Matthew Walker
This quote means that chronic sleep deprivation isn't a minor inconvenience; it's a catastrophic failure for your immune system, leaving you fundamentally more vulnerable to illness.