I mean, given the study they shouldn't be trusted as a single night measure of absolute sleep quality however I don't know of anyone who uses them as such. You

I mean, given the study they shouldn't be trusted as a single night measure of absolute sleep quality however I don't know of anyone who uses them as such. You use them over long periods of time to either get aggregate statistics to compare against baseline or track personal changes over time. edit: Also, the last time I did a sleep study at home it had rather little correlation to how I normally sleep except in terms of apnea. Having wires, electrodes, a chest strap and a finger O2 monitor strapped to me did not lead to a pleasant night of sleep.