He was the first person to suffer from "space sickness" (motion sickness in space) and was also the first person to sleep in space. He slept for roughly one orbit and was surprised to wake with his arms floating in the air due to the absence of normal gravity. He returned to sleep after putting his arms under a security belt, then slept 30 minutes more than predicted by the flight plan. He stated that "Once you have your arms and legs arranged properly, space sleep is fine ... I slept like a baby". [wikipedia]
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