Discord has lived for quite a long time. Centuries as a ruler, a millennium as a rock, years as a reformed draconequus, it all gets very tiring. A nap is exactly what he needs. But when you live forever, time loses its meaning, years pass in the blink of an eye, mortals come and go like mayflies. And that's fine.
After all, any being that is truly important will live forever. Discord would never associate with anything less.

Twilight and her five friends are transported during a botched spell, across dimensions to... Ponyville, Equestria? But not the same one that they knew. Sitting on a bench is Harpsy and Babar. The Doctoress avoids apples from an aspiring Applebuck. And in a library across town, six stallions join their forces as they try to decipher the appearance of filly look-alikes of themselves around Ponyville!