A sleep spell causes a comatose slumber to come upon one or more creatures. Roll 2d4 to determine how many total HD of creatures can be affected. Creatures with the fewest HD are affected first. Among creatures with equal HD, those who are closest to the spell’s point of origin are affected first. No creature with 5 or more HD is affected, and HD that are not sufficient to affect a creature are wasted.
Creatures with fewer HD are affected first.
Sleeping creatures are helpless. Slapping or wounding awakens affected creatures, but normal noise does not. Awakening a creature is a standard action (an application of the aid another action).
Sleep does not target unconscious creatures, constructs, or undead creatures.
Note: Extra hit points are irrelevant for determining how many HD a creature has. An ogre with 4d8+8 hit points still has only 4 HD and can be affected by the spell.