Red marks on the sleep graph

What does the red color mean on the sleep graph?
In the graph that depicts light sleep, rem, and deep sleep, all the shading is in green, but I noticed a red part even lower than deep sleep. Any suggestions?

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I had this the other night. It means no data was collected at that time. For me, it was because my watch died, so everything after didn’t collect data.


Wonderful! I thought I was having a near-death experience :grinning:. Thank you