The material below is Open Game Content from a 3PP Source
Aura faint enchantment; CL 5th
Slot none; Price 132 gp; Weight 1/10 lb.
This +1 arrow is painted white and has white fletching. If it strikes a foe so that it would normally deal damage, it instead bursts into magical energy that deals nonlethal damage (in the same amount as would lethal damage) and forces the target to make a DC 11 Will save or fall asleep.
Requirements Craft Magic Arms and Armor, sleep; Cost 70 gp