Astronauts can thus sleep in any sort of position regardless of where they are.
As a shuttle crew usually comprises five to seven members, they take turns sleeping. When there is a shortage of beds the astronauts will use a sleeping bag attached to a shuttle wall, set up a hammock in the cockpit and sleep there. Astronauts strap their bodies to a belt in the sleeping bag and sleep as they would on Earth Space shuttle beds are equipped with a sleeping bag. The astronaut gets into the bag and straps their body to it in three different places, which allows them to sleep lying down as they would on Earth. For astronauts unable to sleep with the noise of the shuttle's machinery, NASA also provides eye shades and ear plugs.