 Methods: For each site PVAMC and HUP, every other month residents will be randomized to either work the standard schedule which involves interns being on duty for 30 continuous hours vs. the mandatory nap schedule, which involves interns signing out their beepers for 5 hours in the middle of the night to covering night floats and for 3 hours in Year 2. The primary outcome will be the amount slept as measured by actigraphs, with secondary outcomes of cognitive alertness measured by 3-minute psychomotor vigilance testing PVT, Stanford sleepiness Scale, and other measures of resident and patient well-being. 