Second use in a row that my android sleep monitoring device failed. I have one with my iTouch watch, highly inaccurate, not that my Prime Nap app is a whole lot better. It does log the sleep and wake times at each end correctly but my failure to stay asleep as I transition from one sleep cycle to the next it often misses. Its algorithm uses surrogates of sleep such as lack of motor activity suggesting REM but has no way of identifying the CNS wave types that better define the stages. So even when Prime Nap records, it has little correlation with my own assessment of how the night went. I think it went OK last night, delayed onset of sleep but restful once there.
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