Heart Rate Variablity does not work for people who work night shift.

Please analyze HRV for sleep during daytime. With Health Metrics, my HRV shows 0's throughout the week. I will sometimes sleep throughout the night on the weekends I'm off work, like from 11pm to 6am, and I will actually get the HRV reading for that day. My normal sleep schedule on work days, 2pm to 9:30pm, I get 0's. It's been like this for years.
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