How do I interpret timestamps for Sleep?

edited October 2020 in Ask An Expert

If I fell asleep yesterday, at 11pm and woke up today at 7am, what date should I put this information on and what should be the timestamp? Should I put it on yesterday, at 11pm or should I put it on today, at 7am? Which way is more compatible with sleep measuring devices, syncing with Cronometer? Is there such a device which syncs timestamps or they sync only date and duration of sleep?
I plan to buy such a device, but currently I enter sleep data manually...


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