睡眠是极其平常的事,人在一生中有将近1/3的时间在睡眠中度过。可是在太空中睡眠就不那么简单了。在太空失重的环境中,宇航员是不能躺在床上睡觉的,因为身体会自动飘浮起来。因此必须钻进睡袋并固定在舱壁上。座舱内非常嘈杂,除了通信说话的声音外,还有机器设备的响声。这些因素都直接影响着宇航员的睡眠,使他们难以熟睡,经常在睡眠中不是被吵醒就是被惊醒。 Sleep is a very common thing, and people spend nearly a third of their time in sleep. But sleeping in space is not that easy. In a space-less environment, astronauts can not sleep in bed because the body automatically floats. It is therefore necessary to drill into the sleeping bag and secure it to the bulkhead. Cockpit is very noisy, in addition to the voice of communication, but also the sound of machinery and equipment. These factors have a direct impact on astronauts sleep, making it difficult for them to sleep, often in sleep or wake up is not awakened.