Skylab astronaut Alan Bean sleeping, 1973.

Bean is shown here in a sleep restraint during the second manned Skylab mision. The crew consisted of Bean as Commander, Owen Garriot and Jack Lousma. Skylab was launched on 14th May 1973 and was America's first manned orbiting space station. Visiting crews of three astronauts performed experiments to study the Sun, Earth and the impact of life in orbit on the human body. Three crews visited Skylab during its operational life. The last mision ended in February 1974, but Skylab remained in orbit until 1979.