At 8:48 p.m. EST, space shuttle Discovery astronauts Steve Bowen and Alvin Drew will “campout” in the Quest airlock, preparing for Monday’s spacewalk. The airlock’s atmospheric pressure will be lowered to help purge nitrogen from Bowen and Drew’s bloodstreams, protecting them from “the bends” when they leave the airlock for the vacuum of space. The space station crew goes to sleep at 9:53 p.m. EST followed by Discovery’s crew at 10:23 p.m.