It takes 3 rounds to cast this spell, during this time you must read from "Zahn's Bedtime Story Book" uninterrupted.

Each creature affected by this spell falls unconcsious until the spell ends, the sleeper takes damage, or someone uses an action to shake or slap the sleeper awake.

If a creature finds a way to prevent hearing the rest of your tale they must make a DC 16 WIS saving throw or fall asleep for 30 minutes.

ALL creatures regardless of immunities are affected if they have ears.