Why am I tired?

Nine taps, about two minutes. We'll rank the likeliest culprits behind your tiredness and hand you the right two-week test to run first. No email needed, no diagnosis - honest triage.

If tiredness is severe or sudden, see a clinician first - some causes are medical.
METHOD How this is calculated - the formula, the constants and the limits →
RELATED GUIDES
ENERGYWhy is my energy so low? Nine honest causes - and how to find yoursMETHODWhat is an n-of-1 experiment?SLEEPHow to fix your sleep schedule - without white-knuckling it
FREE STARTER KIT
The 14-Day Pattern Finder
Printable check-in sheet + three ready-to-run experiment protocols, by email. Get it →