Inclusion Criteria:  Male 18-40 years old Healthy (assessed via the Exercise and Sports Science Australia (ESSA) survey Endurance trained (2 hours of training at least 3 days per week for a minimum of 3 years) Free from any known sleep disorders or disturbances as assessed by a Pittsburg Sleep Quality Index (PSQI score under 5) Must be willing to live/sleep at the Appleton Institute Sleep Laboratory for 4 (consecutive) nights/5 days (total 96 hours) Must be able to provide written informed consent upon having the study procedure explained to them verbally and in writing. Willing to be prohibited from consuming caffeine and alcohol during the entire stay at the sleep clinic and agree to eat only the standardized meals and snacks and drinks provided.  Exclusion Criteria:  Subject has a clinically diagnosed sleeping disorder Subject has a change in medication over the duration of the study that is known to affect sleep Subject has a current illness that would affect sleep Subject has a current injury that would prevent him from giving maximal effort during the next-morning performance task Participation in another clinical trial within the past 30 days or another PepsiCo/GSSI study within the past 6 months