Hannah works as a flight attendant. her job requires her to work night shift at a local grocery store every other day. she has trouble sleeping, which is most likely due to

The circadian clock controls the sleeping cycle. This internal mechanism is particularly driven by the hormone melatonin which is produced by the body when is little light, mostly when night falls. This hormone tells the brain to rest, and so makes you fell asleep. The night shift that Hanna is taking is messing with her melatonin production and hence her circadian clock making very difficult to her to conciliate sleep the nights that she does not have to work.

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