Fatigue & Alertness

Driver sleepiness and loss of alertness at the wheel: drowsiness, microsleeps, vigilance decrement, sleep loss, and circadian timing.

What's here. Driving studies of drowsiness, microsleep, vigilance, and time_on_task, together with the conditions that set them up: sleep_deprivation, circadian_factors, and shift_work_driving. Sleepiness scales, physiological alertness indices used as outcomes, and driving-performance measures of fatigue sit here.

What isn't here.

• sustained_attention_vigilance as a basic attention construct — Cognitive Psychology Foundations. The vigilance subcategory here is the vigilance decrement in driving. Non-driving vigilance and sustained-attention paradigms, and the signal-detection framing of them, are shelved with the cognitive foundations.
• drowsiness detection algorithms and camera-based driver monitoring — Driver State Monitoring (DMS). Building, validating, or regulating a system that infers sleepiness (eyelid and PERCLOS models, DMS validation) is detection engineering and lives there. This category covers the fatigued state itself, not the detector.
• truck and bus driver fatigue as occupational fatigue — Commercial & Heavy Vehicle Drivers. shift_work_driving here is shift schedules and night driving across drivers generally. Commercial-driver fatigue in a fleet and duty-cycle context is under truck_driver_fatigue, and hours-of-service rules are in policy_enforcement.