Even with the QS Emfit, for me it’s been far from obvious how the previous night(s) sleep influenced my alertness, focus, and willpower during the day. After years of (admittedly not super OCD) sleep tracking, I can’t say I’ve learned anything actionable that I couldn’t have figured out without a sleep tracker (i.e. sleep 7.5 or more hours a night, use earplugs, make the room dark). Whatever effects other interventions have (exercising early in the morning or late at night), they seemed to have been overshadowed by randomness and factors outside my awareness or control.
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