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Your details

Date of birth, sex, height, weight — what you entered at setup. These feed real calculations rather than filling in a form. Age bands nearly every reference range; height and weight drive metabolic rate; sex is an input to published body-composition equations. Keep weight current. Several figures depend on it, and a stale weight quietly skews them.

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Goals

Targets the app measures you against — sleep duration, activity, steps. Sleep goal is the one that changes what you see most: your sleep rings fill against it, so setting it honestly matters more than setting it aspirationally.

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Night Log

A toggle, off by default. When on, and you wake in the night, one tap records it — without properly waking you up. See Sickness and Night Log. Why it is off by default: it is only useful if you are the kind of person who wakes and notices. If you sleep through, leaving it off costs nothing. Why we would like you to try it: what your device thinks was a waking, and what you actually experienced, are different things — and the gap between them is exactly the sort of check we need.

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Morning alarm

Tell the app when you normally wake and whether you use an alarm. Why it asks. A natural waking and an alarm waking are physiologically different. If your alarm cuts a night short, the app should know that rather than reading the truncated night as your natural sleep need. Keep it current. A stale alarm setting quietly distorts your sleep-need estimate.