Sleep for longevity: measurements and limitations

Existing knowledge article; not a hands-on product test.

Sleep is one of the most important daily-life factors for longevity. It influences energy, hunger, training, stress, glucose metabolism, blood pressure and recovery.

Short answer

Consider the following points when interpreting this information:

average sleep duration
regularity
nighttime resting heart rate
HRV trend
subjective energy
context: alcohol, late meals, stress, travel, illness

Which sleep values matter?

Sleep duration

Simple but important. A weekly average is more useful than a single night.

Sleep regularity

Similar bed and wake times make values easier to interpret.

Sleep stages

Wearables estimate sleep stages with limits. Do not treat them as absolute truth.

Resting heart rate and HRV

These can show whether your body is settling down at night.

How can sleep affect other values?

Poor sleep can be connected with:

higher resting heart rate
lower HRV
more hunger
less movement
higher stress
worse glucose control
higher blood pressure

What if you do not have sleep data?

You do not need a wearable. Track for 7 days:

sleep duration
approximate bedtime
wake time
morning energy
alcohol/caffeine/late meals
evening routine
training timing
caffeine window
meal timing
recovery