Immune Status After Being on Call for 24 Hrs

"To characterize the phenotype and function of immune cells in surgery residents before and after a 24-hour shift, and before and after a month of being on call. Along with to investigate the relationship between sleep deprivation, physical activity, and different immune responses."

Participants will be asked to wear their monitor every day for a week. The monitor will collect their step count, sleep and heart rate automatically. Participants will return their monitor at visit 5 (day 30) of the study.