Sleep inducement is the ability to put beings instantly to sleep at will or through the use of technology.
In "Frightmare," Nocturn and his Sleepwalkers use this power to put the citizens of Amity Park to sleep so he can absorb their dreams' energy. In "Urban Jungle," Undergrowth uses sleep spores to put Team Phantom to sleep so he can capture them.
Nocturn and his sleepwalkers can put victims to sleep with a simple wave of their hand. This is usually accompanied by a glowing or sparkle effect.