Real-Time Caffeine Optimization During Total Sleep Deprivation

"Caffeine will be administered to each participant following an individualized optimal dosing schedule created by the 2B-Alert app. Individualized caffeine dosing schedules will be created by the 2BAlert app on the smartphone the participant uses to do Smart-PVT tests. Study staff will run the optimization at 1900 on Day 15. The algorithm will recommend caffeine dosing to optimize performance during the Peak Alertness window (e.g. from 0300-0900 on Day 16, 44-50 hours of continuous sleep loss). Doses could be recommended at any hour from 2000 on Day 15 to 0800 on Day 16. HOWEVER, the algorithm will not exceed 800 mg of caffeine across the entire study AND it will not dose more than 300 mg of caffeine at a time. Gum will be chewed for a total of 10 minutes by each participant and then discarded.~As there will be no placebo in this protocol, randomization and blinding procedures are not necessary. IT IS IMPORTANT TO NOTE THAT SOME PARTICIPANTS MAY NOT RECEIVE CAFFEINE AT ALL."