A sleeping spell is a type of spell that knocks out a target by putting them to sleep.
Charity's Sleeping Spell
In "Memento Mori", Charity Callahan cast a form of sleeping spell on Macy Vaughn. The full effect of the spell is not shown, though Macy is shown to rapidly fall backwards before waking up in the Vortex Viribus.
There are two possible translations for this spell: in Italian, it can be translated to "I quote you sleep", or in Latin, it can be translated to￼ "lie down quickly."
Abigael's Sleeping Spell
In "Dance Like No One is Witching", Abigael Jameson-Caine used a sleeping spell on Harry Greenwood, after he became ill from a demonic parasite and attacked Mel Vera. The spell manifested as a purple energy that wisped about her fingers before forming into an orb which was thrown at Harry, sending the energy through him and knocking him out immediately.
Close your eyes. Stay asleep.
You're less trouble when you don't make a peep.