ESA is working on helping astronauts at the International Space Station get a good night’s sleep. Here are the three keys for an out-of-this-world night's sleep in space. Number 1-scheduling. Crew members keep a tight schedule of 10 working hours max followed by 8 hours of sleep. Secondly, they abide by a regular eating schedule and relaxation periods. And finally, they work a Monday through Friday week with maintenance Saturdays and rest on Sundays. Sounds like it’s all about scheduling! But in the event that they do get off schedule, they go for nature’s sleep aid—melatonin.