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Getting a good night’s sleep is hard. A third of all American adults report getting less than the daily recommended amount of sleep nearly every night. Too little noise, and the mind starts to race.

In 1996, in an episode called “Messages from Earth,” part of the beloved sci-fi TV series Babylon 5, Captain John Sheridan (Bruce Boxleitner) confesses to his Minbari colleague Delenn (the late, great ...