9 (a) computer software for collecting, comparing and analyzing data used in the assessment of sleep and wakefulness patterns and characteristics, sleep personality types, alertness or fatigue levels, sleep disorders, fatigue management, activity-rest patterns, work-rest schedules, duty-rest cycles, shift schedules, and related health issues; (b) computer software for simulating and predicting alertness, sleepiness, fatigue and sleep-wake patterns to optimize work, rest, sleep and related human behaviors and activities; (c) computer software for scheduling of employee work shifts, duty-rest cycles, rosters, call schedules, work assignments, staffing levels and job characterists in order to improve alertness, saftey, human performance, productivity, efficiency or quality of life, and to reduce fatigue and associated errors and accidents; (d) computer software to design employee travel schedules in order to minimize sleep deprivation and jet lag, and to maximize human alertness and sleep quality; and (e) electronic devices and apparatus used to manage and/or monitor environmental conditions for the purpose of assessing and controlling sleep and wakefulness patterns, human alertness and fatigue, namely light, temperature, sound, aroma, vibration and humidity sensors, and noise reduction devices