midday nap could maintain individuals’ vigilance at an optimal level
34 healthy adults
psychomotor vigilance test
Homeostatic sleep pressure accumulated
induced the declined vigilance performance
homeostatic sleep pressure increased cortical excitability but decreased cortical communication efficiency from morning to mid afternoon.
cognitive functions fluctuate across the day, known as the time-of-day effect
Vigilance, also known as sustained attention,
maintaining the required state of arousal to detect and quickly react to unpredictable stimuli in the environment over prolonged periods, which is highly sensitive to the time-of-day effect
In general, vigilance levels gradually improve in the morning after dissipating sleep inertia
mid afternoon, vigilance has a significant decline
traffic accidents frequently occur (Correa et al., 2014) and working people suffer poor performance and increased errors in the workplace (Askaripoor et al., 2019).
homeostatic and circadian processes act in opposition to promote wakefulness
In the morning, sleep pressure is low and the circadian drive for wakefulness gradually increases, contributing to the high vigilance state
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