If reading a dusty spellbook and olfaction() is true plus some random chance (perhaps the same as sleep from a dull spellbook), you sneeze and wake monsters nearby. (YANI #2005)
Eating a carrot is crunchy enough to wake up monsters (YANI #2039)
Rolling boulder trap rumbling wakes monsters (trigger this from the start and end of its path, YANI #2250)
Imp taunting wakes up monsters (YANI #2918)
Additionally, if feasible, monsters stepping on a squeaky board near you when you are asleep should wake YOU up.
copperwater
commented
7 months ago
Additionally, if feasible, monsters stepping on a squeaky board near you when you are asleep should wake YOU up.