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There are a variety of ways astronauts can sleep in space, depending on the mission and personal preference. Since there is no "up" in space, they can comfortably sleep vertically as well as horizontally. On space shuttle missions, they often sleep in their seats, in sleeping bags attached to the walls of the shuttle, or by tethering themselves to the walls. However, in the new International Space Station, astronauts sleep in the Habitation Module, which features sleeping bags attached vertically to the module walls. To take an interactive tour of the Habitation module, visit this page. (You will need to download and install a free plug-in, but the 360-degree tour is well worth it.) Since the Space Station temperature is maintained at a comfortable 72 degrees Fahrenheit, the preferred sleeping attire is a T-shirt and shorts. And, just in case you were wondering, microphones have officially proven that astronauts can snore in space (previously, researchers weren't certain if gravity was required for snoring).
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