___(NOTE: Note: no official Abstract exists of this Phase II projects. Abstract is modified by idi from relevant Phase I data. The specific Phase II work statement and objectives may differ)___ biomedical equipment development, circadian rhythm, photostimulus, sleep disorder light intensity, melatonin, portable biomedical equipment, saliva, sleep deprivation, travel, wakefulness bioengineering /biomedical engineering, clinical research, human subject