Seeing a poor sleep score from a sleep tracker can lead individuals to feel worse and have a worse day.

“people often will bias their sense of daytime wakefulness based on their sleep score more than their subjective score.”

“if people see a poor sleep score they often feel worse than if they see a good sleep score now of course physiology matters you can't lie to yourself and say you you know got a great night of sleep simply by virtue of a sleep score but I worry more about the the false well I if it's a false negative that we don't want to put veilance on this seeing a bad sleep score and then deciding that you're going to have a terrible day”

“Maybe I would say go about halfway through your day if you can bear to do it before looking at your sleep score and see how you feel. Then look at your sleep score as opposed to the other way around. That might be a good way to adjust for that belief effect I just mentioned.”

“Some people like to sleep trackers, using their Eight Sleep or their WHOOP or their Oura Ring or something like that. I'm a fan of sleep trackers, but I think that relying too heavily on sleep scores can be risky. There are data from Alia Crum's Lab at Stanford showing that if people receive a poor sleep score, even though they slept well, their performance will drop. If people get a good sleep score, even though their sleep was lousy, their performance is maintained or even enhanced.”

“Because it just biases how you feel. Our colleague Ally Chrome at Stanford has done some nice experiments where they tell people after a a genuinely poor night's sleep they got a great sleep or they tell people after a great night's sleep they got poor sleep and they they show them a sleep score and they give them some data and it's false data basically and people's levels of alertness, well-being, etc. are strongly biased by what they are told their sleep was like as opposed to what it was actually like.”