Sleep supports immunity, metabolism, memory and recovery. Biological-age tracking should consider regularity and daytime function alongside duration.
Regularity as well as duration
Sleep needs vary. Consistent timing, sufficient duration and daytime alertness create a more useful picture together.
Signals you can track
Bed and wake times, awakenings and morning freshness fit into a simple diary.
For a steadier rhythm
- 1Set a consistent wake time first.
- 2Get morning daylight.
- 3Keep caffeine earlier in the day.
- 4Seek professional help for persistent insomnia.
Limitations
A sleep score or duration alone does not diagnose disease. Snoring, breathing pauses or severe daytime sleepiness need assessment.
Sources and update
2026-09-23
fjt methodology