circadian-rhythm

Sleep is not the brain going quiet — it is the brain running a completely different operating mode. During those hours, it flushes toxic proteins, consolidates memories, and resets emotional circuits. Here is what the science actually shows.

Why does jet lag happen and why is going east worse? The circadian science of body clocks, light, melatonin, and evidence-based recovery strategies.

Why do meals make you sleepy? The science of food coma — insulin, orexin neurons, the circadian dip, and the tryptophan myth.

How the circadian rhythm works: the brain's master clock, clock genes, light, melatonin, and what shift work and late eating do to a 24-hour body clock.

Earth spins at 1,674 km/h at the equator. If it suddenly stopped, supersonic winds would devastate the surface. If it slowed gradually, the consequences are still severe — a 6-month day, ocean redistribution, and a collapsing magnetic field.

Understand adult sleep recommendations, evening exercise evidence, and why persistent insomnia deserves clinical assessment and structured treatment.