The onslaught of apparent days and nights would play havoc with astronauts’ body clocks, so a shutters-down and bedtime schedule is imposed by mission controllers. Each of the crew has a closet-like cabin where they can hook a sleeping bag to the wall and settle down for the night. Some strap pillows to their heads to make it feel more like lying down. The lights don’t go out completely, though. People dozing in orbit see streaks and bursts of bright color caused by high-energy cosmic rays painlessly slamming into their retinas. Fans and air filters add to the distractions, so some astronauts wear ear plugs to block out the constant hum.

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