Estimated sleep from an under-mattress device predicts next-day vigilance, working memory, and mental arithmetic performance

Study Objectives: Sleep is vitally important to maintain cognitive function, particularly in shift-work contexts. Sleep trackers can reliably estimate sleep, but the relationship between estimated sleep and specific cognitive domains is unclear. This study examined associations between estimated sleep and subsequent cognitive performance during a simulated night-shift protocol. Methods: Twenty-four participants (mean [SD] age = 28[9] years) attended the sleep laboratory twice, for an 8-day simulated shift-work experimental protocol under two lighting conditions (standard- vs. circadian-informed lighting). Following a baseline sleep, participants remained awake for 27 h and transitioned to sleeping between 10:00 and 19:00 with cognitive testing between 00:00 and 08:00 for four days. Tests included the Balloon Analogue Risk Task, Continuous Performance task, Digit Symbol Substitution Test (DSST), Iowa Gambling task, Operation-Span task, Psychomotor Vigilance test, Stroop task, Tower of London task, and Trail Making test. Sleep was assessed using an under-mattress sensor (Withings Sleep Analyzer). Linear and non-linear models were used to test associations between estimated sleep and cognitive performance. Results: Significant associations were found between sleep metrics and PVT reaction time (R ²  = .13, p = .008), Operation-Span arithmetic errors (.15, p = .023), proportion correct on DSST and Stroop tasks (.06, p = .045; .09, p = .003), and Stroop reaction time (.19, p = .004). Random forest models demonstrated that vigilance, working memory, and mental arithmetic were associated with estimated sleep architecture, snoring, and cardiovascular function. Conclusions: Sleep trackers could inform next-day cognitive performance, particularly vigilance, mental arithmetic, and working memory. In so doing, they may enable more informed interpretations of device-derived sleep and management of sleep-related cognitive impairment in future models. This paper is part of the Consumer Sleep Technology Collection. Consumer sleep trackers are increasingly being utilized to predict fatigue or cognitive performance as markers of workplace risk. There is increasing evidence of this utility in predicting alertness, but evidence supporting appropriateness across other cognitive domains is lacking. This study demonstrated that device-derived metrics from a consumer under-mattress sleep sensor predicted vigilance, working memory and mental arithmetic with reasonable accuracy. However, other domains such as decision-making and risk-taking were poorly predicted. Implementation of consumer sleep trackers in performance prediction should consider whether the cognitive demands of the work align with the capabilities of the sleep tracking measurement.