When testing drawbridge stuff recently I ended up with an unseen
monster who evidently cast the aggravation spell repeatedly, yielding a
steady stream of "you feel that monsters are aware of your presence"
messages. This patch makes monsters tend to avoid repeating that spell
once everyone on the level has already been woken up. It also extends
the spell effect so that it will wake monsters like quest nemesis and the
Wizard who ordinarily wait until you get close before they become active.