I just read this thread, but I like pretty much everything that has been said. With the guards not out, Pyrats should roam york, Baddies should roam other places, bats should come out on overworld, Different bugs should be present such as more lightning bugs and things such as spiders/scorpians and less day bugs. Lanterns would be so cool bug i understand the problems associated. Mabye more of a threat to dying, since its night. Mabye at late night if you die you go to the closest spawn point? (EXA: unstuck me, hotels/inns, tower spawns)

One thing to add that I thought sounded insanely fun. If at night, when you die you respawn at respawn points. Then there could be another guild activity in which they have leaderboards for guild night kills ratio. It could be called "Night-kill" scores. Or mabye its based on K/D. Or somthing. Many cool guild things could be added along with nighttime PK-world zone.