Nicholas I Y N Chee
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View article: Closed-loop auditory stimulation (CLAS) does not improve sleep or declarative memory in chronic insomnia
Closed-loop auditory stimulation (CLAS) does not improve sleep or declarative memory in chronic insomnia Open
Objective Investigate whether auditory closed-loop stimulation (CLAS) applied during sleep could be beneficial for sleep and declarative memory in individuals with chronic insomnia. Methods We performed a randomized crossover sham-controll…
View article: Performance of wearable sleep trackers during nocturnal sleep and periods of simulated real-world smartphone use
Performance of wearable sleep trackers during nocturnal sleep and periods of simulated real-world smartphone use Open
Performance of Oura and Fitbit is robust on nights with suboptimal bedtime routines or minor sleep disturbances. Reduced performance on nights with low sleep efficiency bolsters concerns that these devices are less accurate for fragmented …
View article: Selecting a sleep tracker from EEG-based, iteratively improved, low-cost multisensor, and actigraphy-only devices
Selecting a sleep tracker from EEG-based, iteratively improved, low-cost multisensor, and actigraphy-only devices Open
EEG-based Dreem is recommended when evaluating poor quality sleep or when highest accuracy sleep-staging is required. Iteratively improved non-EEG sleep trackers (Oura, Fitbit) balance classification accuracy with well-tolerated, and econo…
View article: A Data Driven Approach for Choosing a Wearable Sleep Tracker
A Data Driven Approach for Choosing a Wearable Sleep Tracker Open
Goal and Aims To evaluate the performance of 6 wearable devices across 4 device classes (research-grade EEG-based headband, research-grade actigraphy, high-end consumer tracker, low-cost consumer tracker) over 3 age-groups (young: 18-30y, …
View article: An automated heart rate-based algorithm for sleep stage classification: Validation using conventional polysomnography and an innovative wearable electrocardiogram device
An automated heart rate-based algorithm for sleep stage classification: Validation using conventional polysomnography and an innovative wearable electrocardiogram device Open
Background The rapid advancement in wearable solutions to monitor and score sleep staging has enabled monitoring outside of the conventional clinical settings. However, most of the devices and algorithms lack extensive and independent vali…
View article: Multi-Night at-Home Evaluation of Improved Sleep Detection and Classification with a Memory-Enhanced Consumer Sleep Tracker
Multi-Night at-Home Evaluation of Improved Sleep Detection and Classification with a Memory-Enhanced Consumer Sleep Tracker Open
These results affirm the benefits of applying machine learning and a diverse training dataset to improve sleep measurement of a consumer wearable device. Importantly, collecting raw data with appropriate hardware allows for future advancem…
View article: An automated heart rate-based algorithm for sleep stage classification: validation using conventional PSG and innovative wearable ECG device
An automated heart rate-based algorithm for sleep stage classification: validation using conventional PSG and innovative wearable ECG device Open
Study Objectives Validate a HR-based deep-learning algorithm for sleep staging named Neurobit-HRV (Neurobit Inc., New York, USA). Methods The algorithm can perform classification at 2-levels (Wake; Sleep), 3-levels (Wake; NREM; REM) or 4-l…
View article: Multi-Night Validation of a Sleep Tracking Ring in Adolescents Compared with a Research Actigraph and Polysomnography
Multi-Night Validation of a Sleep Tracking Ring in Adolescents Compared with a Research Actigraph and Polysomnography Open
Nicholas IYN Chee,* Shohreh Ghorbani,* Hosein Aghayan Golkashani, Ruth LF Leong, Ju Lynn Ong, Michael WL Chee Centre for Sleep and Cognition, Yong Loo Lin School of Medicine, National University of Singapore, Singapore*These authors contri…
View article: Reopening after lockdown: the influence of working-from-home and digital device use on sleep, physical activity, and wellbeing following COVID-19 lockdown and reopening
Reopening after lockdown: the influence of working-from-home and digital device use on sleep, physical activity, and wellbeing following COVID-19 lockdown and reopening Open
Study Objectives COVID-19 lockdowns drastically affected sleep, physical activity, and wellbeing. We studied how these behaviors evolved during reopening the possible contributions of continued working from home and smartphone usage. Metho…
View article: Cortical thinning and sleep slow wave activity reductions mediate age-related improvements in cognition during mid-late adolescence
Cortical thinning and sleep slow wave activity reductions mediate age-related improvements in cognition during mid-late adolescence Open
Study Objectives Gains in cognitive test performance that occur during adolescence are associated with brain maturation. Cortical thinning and reduced sleep slow wave activity (SWA) are markers of such developmental changes. Here we invest…
View article: Multi-Night Validation of a Sleep Tracking Ring in Adolescents Compared with a Research Actigraph and Polysomnography
Multi-Night Validation of a Sleep Tracking Ring in Adolescents Compared with a Research Actigraph and Polysomnography Open
The Oura ring yielded comparable sleep measurement to research grade actigraphy at the latter's default settings. Sleep staging needs improvement. However, the device appears adequate for characterizing the effect of sleep duration manipul…
View article: Memory performance following napping in habitual and non-habitual nappers
Memory performance following napping in habitual and non-habitual nappers Open
Study Objectives Afternoon naps benefit memory but this may depend on whether one is a habitual napper (HN; ≥1 nap/week) or non-habitual napper (NN). Here, we investigated whether a nap would benefit HN and NN differently, as well as wheth…
View article: Cognitive effects of split and continuous sleep schedules in adolescents differ according to total sleep opportunity
Cognitive effects of split and continuous sleep schedules in adolescents differ according to total sleep opportunity Open
Study Objectives We compared the basic cognitive functions of adolescents undergoing split (nocturnal sleep + daytime nap) and continuous nocturnal sleep schedules when total sleep opportunity was either below or within the recommended ran…
View article: Evaluation of an interactive school-based sleep education program: a cluster-randomized controlled trial
Evaluation of an interactive school-based sleep education program: a cluster-randomized controlled trial Open
Sleep education alone may not be sufficient to change sleep behavior. A combination of sleep education, starting school later, and parental involvement may be needed to encourage and enable changes in adolescent sleep duration.
View article: Sustained benefits of delaying school start time on adolescent sleep and well-being
Sustained benefits of delaying school start time on adolescent sleep and well-being Open
Delaying school start time can result in sustained benefits on sleep duration, daytime alertness, and mental well-being even within a culture where trading sleep for academic success is widespread.
View article: Auditory stimulation of sleep slow oscillations modulates subsequent memory encoding through altered hippocampal function
Auditory stimulation of sleep slow oscillations modulates subsequent memory encoding through altered hippocampal function Open
Acoustic stimulation during a nap can benefit encoding of declarative memories. Hippocampal activation positively correlated with SO augmentation.