Summary — 29 of 30 nights with readings

How these were measured

A sensor under the mattress records presence, heart rate, breathing rate, movement, snoring and sleep stage every minute, without contact. "Up at night" means out of bed for two minutes or more. Heart and breathing rates are the median of the minutes spent in bed; the range excludes the highest and lowest 5% of minutes. Time asleep and sleep stages are the sensor's own estimate from movement, heart rate and breathing; lying very still while awake can be counted as light sleep. "Restless" counts only stretches of five minutes or more of continuous movement; ordinary turning in sleep is not counted. "Flags" are episodes in which the sensor's own algorithm reported that it could not detect breathing, or saw readings outside its normal range, for several seconds; the commonest cause is the person turning away from the sensor, and a flag is not a finding. They have not been reviewed by a clinician. Bathroom visits are counted by a movement sensor at the bathroom door. Blood pressure readings come from the home's own upper-arm cuff and are shown exactly as the cuff reported them, with any note the cuff attached (movement, loose cuff, irregular pulse). Readings taken less than 10 minutes apart are counted as one sitting; the "average of each sitting" is the plain mean of its readings. This report records what the sensors measured; it does not interpret it.