By this spell song any specified creature (a single humanoid or animal) within the area of affect must save versus sleep/charm or fall asleep. Deaf or unhearing creatures are not affected by this spell song. Creatures that cannot sleep (such as Constructs and most Undead) are not affected by this spell. One person per round can be targeted, and the subject will stay asleep for a turn. If the person actually wants to be targeted (i.e. for a treatment for insomnia), the target can purposefully fail the save and then sleep for 1d4+4 hours. The Wishsinger can actively target only during the "duration" period. The resonance period indicated how long a targeted person will sleep.