Cluster Article
Tracking Sleep Debt Without Buying Expensive Hardware
You can track sleep debt using your phone. It will be less precise than a ring. It can still save the day you were about to overbook.
What sleep debt means here
A running deficit versus the sleep you need. Not a diagnosis. Not a sleep-stage report.
Phone-only methods
Inactivity and movement estimates, plus how you feel the next day. MaxDex logs this locally and feeds the energy picture.
Related
Then change the plan
If the tracker does not resize work, it is a graph. Tie it to an energy-aware schedule and a gentler call on depleted mornings.
7 min read · 2026-08-13
Frequently asked questions
Do I need the phone on the mattress?
Keep it nearby as usual. This is not a clinical mattress sensor product.