Phone Placement
Sleep Tracking When the Phone Stays Near the Bed
Searches for sleep tracker phone on mattress only are about placement, not another wearable. MaxDex estimates sleep from inactivity and movement while the phone is nearby—then turns that into tomorrow’s energy plan.
Nearby is the requirement, not a lab mat
You do not need a dedicated under-mattress sensor. Keep the phone where you already keep it at night. Estimates will be coarser than a ring. They will still show collapsing nights.
What we will not claim
No sleep-stage medical accuracy. No “as good as Oura.” A practical sleep debt signal for people who will not buy hardware.
Use the number in the morning call
If last night was short, the briefing should not pretend you have a peak-focus eight-hour day. That is the whole point of phone-only tracking.