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Everyone gets the same 24 hours, but the output of an hour depends heavily on your state — which makes energy a smarter scheduling resource than time. Most people settle into a rough daily shape: a peak (often, though not always, in the morning), a post-lunch trough, and a late-afternoon rebound. The honest version of chronotype science is simply tracking your own three phases for a week and then matching task difficulty to energy: deep work in the peak, email and admin in the trough, collaborative work in the rebound. This guide covers the tracking method and the scheduling pattern, with slack built in for the bad nights that happen to everyone.
Match tasks to your natural energy instead of fighting it — learn your personal peak, trough and rebound times, and schedule deep work, admin and rest to fit them.
Then your peak is not in the morning — roughly a third of people genuinely focus best later in the day. The whole method is tracking your own shape rather than adopting someone else's, so a night-peak pattern gets the same treatment, shifted.
Three rough marks a day — high, medium or low — at set points, for one week. That is enough to reveal the pattern, and the effort is under a minute a day.
The schedule is a pattern with slack, not a rigid timetable. On a bad day you drop the deep-work block to the rebound window or shrink it — the system absorbs bad days instead of breaking on them.
Every tool answers instantly from our own knowledge and calculators — no AI wait, no account. Rest is productive: these tools free your time, they do not fill it. Want the deeper, personalised version? Each has a $2.95 full report.