EEG wearables enable at-home evaluation of sleep architecture and staging but they are expensive and somewhat technologically complicated. Sleep diary methods are simple and economical ways of tracking and appraising sleep by consumers but because they entail subjective self-ratings, they are often inaccurate and incomplete furthermore, they do not assess sleep architecture and stages. Thus, it is not surprising less than 50% of sleep studies nowadays are conducted in formal sleep facilities. Additionally, PSG requires a special facility plus oversight by skilled technicians, making it expensive and precluding, under most circumstances, investigation of between-night variation of sleep quality. However, the environment and instrumentation of conventional PSG can be uncomfortable, anxiety producing, and even sleep disturbing. PSG is regarded as the gold standard for diagnosis of sleep disorders and conduct of sleep research. Polysomnography (PSG) consists of simultaneous electroencephalographic (EEG), electromyographic, electrooculographic, electrocardiographic, and other assessments. Sleep-staging Fitbit models showed higher sensitivity (0.95-0.96) and specificity (0.58-0.69) values in detecting sleep epochs than nonsleep-staging models and those reported in the literature for regular wrist actigraphy. Sleep-staging Fitbit models, in comparison to PSG, showed no significant difference in measured values of WASO ( P=.25 heterogenicity: I 2=0%, P=.92), TST ( P=.29 heterogenicity: I 2=0%, P=.98), and SE ( P=.19) but they underestimated SOL ( P=.03 heterogenicity: I 2=0%, P=.66). Recent-generation Fitbit models that collectively utilize heart rate variability and body movement to assess sleep stages performed better than early-generation nonsleep-staging ones that utilize only body movement. In reference to PSG, nonsleep-staging Fitbit models correctly identified sleep epochs with accuracy values between 0.81 and 0.91, sensitivity values between 0.87 and 0.99, and specificity values between 0.10 and 0.52. In reference to polysomnography (PSG), nonsleep-staging Fitbit models tended to overestimate total sleep time (TST range from approximately 7 to 67 mins effect size=-0.51, P<.001 heterogenicity: I 2=8.8%, P=.36) and sleep efficiency (SE range from approximately 2% to 15% effect size=-0.74, P<.001 heterogenicity: I 2=24.0%, P=.25), and underestimate wake after sleep onset (WASO range from approximately 6 to 44 mins effect size=0.60, P<.001 heterogenicity: I 2=0%, P=.92) and there was no significant difference in sleep onset latency (SOL P=.37 heterogenicity: I 2=0%, P=.92). After eliminating duplicates and in compliance with inclusion and exclusion criteria, 22 articles qualified for systematic review, with 8 providing quantitative data for meta-analysis. This rarely happens when using a Fitbit device.The search yielded 3085 candidate articles. On more than one occasion, I've gotten into my gym gear and was ready to hit the treadmill to suddenly receive a notification that my watch had only 10% battery left. The bigger issue, though, isn't the convenience - it's changing my routine to actually remember to take my watch off and charge it. That's the approach I've decided to take recently, considering I'm not using it for activity tracking or social notifications when I'm at my desk. ![]() You can, for example, charge the watch briefly throughout the workday when you probably don't have much use for it anyhow. It's not impossible or impractical to get through the day without charging your watch overnight. Like many Apple Watch owners, I've gotten into the routine of charging my watch overnight alongside my iPhone.īut using the Apple Watch as a sleep tracker has forced me to re-think this and develop new habits. Until this point, it didn't really matter that the Apple Watch couldn't offer multi-day battery life. In both cases, that's much longer than the battery life on the Apple Watch Series 5, which I've found to last for about a day and a half. That also lines up with the experience other reviewers have had with the Fitbit Versa 2 when it comes to battery life. With that capability switched on, I've been able to get about two days of battery life. In my past experience, the Fitbit Versa 2 lasts around four or five days on a single charge with the always-on-display feature turned off. The Apple Watch Series 5 (left) and Fitbit Versa 2 (right)
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