ELLE (Canada) - - Body -

Cur­rently in beta-test­ing but set to launch later this year, the new Sleep Score pro­gram from Fitbit uses a wrist sen­sor—avail­able on the new Fitbit Charge 3 ($200)—to mea­sure oxy­gen sat­u­ra­tion in the blood, which can be telling of prob­lems like sleep ap­nea. (It is not, how­ever, a di­ag­nos­tic tool.) An al­go­rithm, which takes other vari­ables like heart rate into ac­count, gives you a nightly sleep score, break­ing down time spent in light, deep and REM sleep cy­cles. Sweet dreams.

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