NASA has revealed that astronauts in space suffer from sleep deprivation. According to a 10 year study it shows astronauts get an average of only six hours of sleep a night. NASA orders crew members to get at least 8.5 hour of sleep but that’s not happening.

Eighty-five crew members were studied between 2001 and 2011 using a special wrist watch that studies sleeping habits and three-quarters of them had to use a sleeping pill for more than half their nights in space.

Space wasn’t the only place astronauts weren’t getting the proper amount of rest. During their three month pre-flight training period they were getting 6.5 hours. NASA is looking into ways to promote natural sleep because loss of sleep leads to loss of performance.