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How you feel is the primary metric

"You felt worse" is the only directional signal you need.

Galpin always starts with subjective: how do you feel? If you have good energy and wake up feeling good, take a breath.

When you feel worse, go backwards: what did you do yesterday? That's why SleepShred asks for a 1–5 morning rating and a daytime energy rating every day and treats them as headline numbers, above anything a wearable computes.

Sources · 2

Performance of seven consumer sleep-tracking devices compared with polysomnographyChinoy ED, Cuellar JA, Huwa KE, et al. · 2021Consumer devices estimated total sleep well but were poor at sleep stages — trust duration, not deep/REM.The cumulative cost of additional wakefulnessVan Dongen HP, Maislin G, Mullington JM, Dinges DF · 2003Two weeks at 6 h/night produced deficits equal to two nights of total deprivation — while subjects felt only mildly sleepy. You adapt to feeling tired, not to being impaired.

Related topics

Sleep duration & healthWearables & tracking

Frequently asked questions

How you feel is the primary metric?

"You felt worse" is the only directional signal you need.

Is SleepShred free?

No. SleepShred Pro is $4.99 per month or $29.99 per year, with no free trial and no ads. Everything stays on your iPhone.

Track it, don't guess it

SleepShred turns this research into a 20-second daily habit: log your night, see which of your own behaviours move your sleep, and screen for the disorders nobody diagnoses.

Get SleepShred for iPhone

Educational summary of published research, not medical advice. Screening scores are not diagnoses. If a score is elevated or you feel unwell, talk to a clinician.