Fay Schwinger

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Fay Schwinger
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Interesting. . . a calculator that tells you the best times to fall asleep depending on what time you need to wake up in the morning

Sleep cycles & a calculator that tells you the best times to fall asleep depending on what time you need to wake up in the morning. How interesting- if you need to be up at this says to go to sleep at either or due to different sleep cycles.