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Aside from reconstituted spinach, astronauts have to deal with disrupted sleep cycles due to the station orbiting around the Earth every 90 minutes. Lighting Science has created special lightbulbs for the International Space Station. There are daylight bulbs with bluer light to encourage energy and activity during what would be daytime hours, and then there are lightbulbs that dial back on the blue to boost astronauts' production of melatonin for a good night's sleep.