SleepShred
Resting heart rate: the canary in the coal mine
In 1,200 nights of one client's data, every 1 bpm drop in RHR = ~6 more minutes of sleep.
Galpin's team found in a long ring dataset that each one-beat drop in resting heart rate came with six more minutes of sleep. Two levers move it: cardiovascular fitness (endurance training lowers RHR ~5 bpm on average) and down-regulation before bed (a calmer nervous system going into bed → longer sleep).
For a busy person it became the one thing to pay attention to: do whatever it takes to keep heart rate low going into bed. Alcohol is the fastest way to push it the wrong way — even 'low' intake cuts sleep HRV by ~9%.
SleepShred computes the same correlation on your own data once you have enough nights with resting HR (from Apple Health or manual entry).
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Frequently asked questions
Resting heart rate: the canary in the coal mine?
In 1,200 nights of one client's data, every 1 bpm drop in RHR = ~6 more minutes of sleep.
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 iPhoneEducational 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.