In science fiction, sleep is a pastime. For the sake of continuity, characters are put into suspended animation so the reader can travel with them across vast expanses with neither suffering catastrophic ennui. Sure, sleep facilitates other things, too – vivid dreamers communicate with aliens and sleep-deprived characters make every kind of mischief sooner or later – but SF is really big on sleeping beauties.
Which is a shame, when you think about it. Sleep itself is in many ways still a frontier. We have some interesting ideas about sleep and learning, problem-solving, fat, food, puberty, immunity, blood pressure, loneliness… Name anything to do with the body, and it appears to be affected by sleep in one way or many, yet SF largely neglects to explore sleep past its nearest and most familiar boundaries.
Returning to the idea of character continuity; even that tired old plot device has been only superficially explored. What if the brain activity while we sleep is the process by which we maintain our personal continuity from day to day? How might suspending that activity for the duration of long spaceflights disrupt our capacities or even our identities? Or, if sleep-state brain activity is somehow maintained during suspended animation, wouldn’t the brain develop physiological changes over time? If so, how would they present in terms of behavior?
There are an abundance of dimensions of sleep still open for speculation. In fact, as soon as I finish this post, I’m going to navigate a few of them with my eyes closed. But what about the reader? What interesting treatments of sleep have you found in SF? And what other interesting biological phenomena would you like to see better explored in fiction?