User blog comment:JoePlay/The Sims 3: Late Night has Vampires. How much does this make your blood rush?/@comment-3012111-20101029225008/@comment-24.224.224.60-20101030031312

Well, I wondered that too, but it doesn't seem to affect my sim much. Her thirst, fun, and such go down a bit faster, but nothing really. :) They just lose their powers during the day.