Haha, my dwarfs don't sleep anymore.
My engraver had a fey mood and wanted Adamantine, but my area has none.
So he went insane, then engraved over half my fortress with engravings of things like tentacle demons "embracing" dwarfs, and mandrills mangling men (a pack of mandrills killed the human traders later that year).
Anyway after about three gamedays of dwarfs vomiting all over everything, they're now very stable (aside from the nineteen who killed themselves) and haven't slept in a whole season.
As a result I now have a series of magma waterfalls down the side of my chasm because it fascinates me, and I also made a sauna (magma and water flowing into a room below the sauna room with a grated floor) and even managed to construct a nine level high, four space thick marble curtain wall outside.
Then I got bored and made a second curtain wall outside the first one and filled the gap with magma.