As a pensioner with a bad back, i relax in my bed several times during the day, as others woud use a comfortable chair.
The sleep mat, at best, reports a nap, and worse extends my relaxations to be included in the nights sleep.
I kindly suggest a setting for the mats reporting hours, to exclude my daytime use of the bed.
Say, a setting of time to f.ex. log sleep between 21:00 and 9:00, and not pay attention outside that window of time.