The creature is a loathsome cross between a human, a stirge, and an abyssal fly. It stands on four stirge-like hind legs and grasps with its humanlike forelimbs, which end in chitinous claw-like fingers. It has the wings of a stirge, though wrinkled and seemingly useless. Its stirge-like head has distinctly human features and is topped with a bristled, backswept mane. Its mouth is tiny and filled with fangs, though its nose is long and sharp and is used to pierce and draw blood.
Speed 20 ft., fly 60 ft. (good)
Str 22, Dex 17, Con 23, Int 14, Wis 14, Cha 15
At all times, save when using any spell-like abilities, the stirge demon drones and buzzes like a fly. All creatures within a 60-foot spread that hear it must succeed on a DC 20 Will save or fall into a comatose sleep for 1d4 hours. There is no HD limit for this effect and it otherwise functions as the sleep spell (CL 10th). Note, the stirge demon can drain blood from a sleeping creature without automatically waking it up. In such an event, the sleeping creature receives a new Will save (same DC) each round the stirge demon drains blood. The save DCs are Constitution-based.