A Sleepless Night
by Alfred AustinThe beginning of the poem may be a bit confusing unless we recall that Aristotle believed that the sun, the moon, and the stars were all attached to spheres, and that these spheres operated in harmony. So although almost no one believed that theory in Austin's time, Austin is probably using Aristotle's idea figuratively, so that the planets chime like a clock. I don't think we're supposed to believe that the planets are literally audible.
The synesthesia--or deliberate mixing of senses--of "cloistered from deafening sight" works well. (Apparently, synesthesia may also refer to an actual condition, in which, for example, a person might associate numbers with colors.) It works well, I think, because "cloistered" from sight, lying in bed, we do tend to turn things over to the ears, whereas when we're up and about, our focus on things we see may make us less aware of what we hear.
The person in Austin's poem seems to welcome this "cloistered" situation and enjoys listening to what he might not have heard were he awake and looking out a window, but probably most insomniacs get annoyed by hearing every little noise. Almost everything seems too loud when you can't sleep. "Life through Time's stops" refers, I believe, to an organ, which has stops that an organist manipulates. The sonnet ends more gloomily than we might have expected: ya think?! It takes a morose Victorian turn, just when we thought the guy was fairly sanguine about being awake at night.