Sleep is where your body does most of its overnight anti-inflammatory work. Skimp on it and everything else gets harder.
Both short and irregular sleep duration are consistently linked to elevated inflammatory markers.
Time spent in deep and REM sleep matters as much as total hours — fragmented sleep blunts recovery even at 8 hours.
Frequent waking interrupts the deeper sleep stages where much of nightly repair happens.
A stable sleep and wake time supports circadian rhythm, which itself regulates immune function.
Your own subjective sense of how rested you feel is a surprisingly reliable daily signal, and it's the simplest to log.
Each morning, THE FAD asks for hours slept, a quick 1–5 quality rating, and how recovered you feel. Connect a wearable later (Apple Health, Garmin, Fitbit, Whoop) and it fills in automatically.
Why this matters more than people think: one poor night rarely tanks your score on its own — but a pattern of short, inconsistent sleep will show up clearly in your 7-day average, often before you consciously notice you're run down.
THE FAD