# How you feel is the primary metric

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



## Takeaways

- Rate every morning.

- Rate your daytime energy.

- Correlate bad mornings with what you did the day before (Day log).



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

- Performance of seven consumer sleep-tracking devices compared with polysomnography (Chinoy ED, Cuellar JA, Huwa KE, et al., 2021)

- The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation (Van Dongen HP, Maislin G, Mullington JM, Dinges DF, 2003)

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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.

SleepShred for iPhone: https://apps.apple.com/app/id6802040541