Figure 1.

Double raster plot of the 47-day study protocol. The horizontal axis represents time of day and is 48 hours in length. Black bars represent the scheduled bed-rest episodes. Subsequent days of the experiment are plotted both to the right of and below the previous day. After 3 baseline 24-hour days with 8 hours of scheduled bed rest, subjects began the forced desynchrony segment of the study, during which they were scheduled to live on a 28-hour day, with 9.33-hour bed-rest episodes beginning 4 hours later each day. This continued for 36 forced desynchrony days (equivalent to 42 calendar days).