ISS inhabitants sleep strapped to the wall and experience 16 sunrises a day.
We humans have enough trouble keeping our sleep schedules aligned with sunrise and sunset on Earth — so one can only imagine what it must be like trying to get a good night’s rest on the International Space Station . Not only does the orbiting laboratory make a lap around our planet once every 90 minutes, meaning astronauts onboard experience a whopping 16 sunrises and sunsets every single day, but its inhabitants are constantly weightless.
"Circadian rhythm" refers to the types of physical, mental and behavioral changes that happen to an individual over a 24-hour time period — and as you might imagine, one of those changes is how sleepy or wakeful that individual may feel. This is actually why the phenomenon is often called our"internal clock." But most importantly with regard to this study, our circadian rhythms are directly associated with light we’re exposed to .
In a way, experts say, sunlight is a major cue that our bodies use to calibrate our internal clocks. That’s why daylight savings is known to impact our sleep schedules, and why a sunrise alarm clock is considered an effective way to help you organically wake up rested and ready to go.
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