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Is there a restriction on the level of creatures that can be affected by the Wand Of Sleep?
I never usually bother with it but I noticed that it's description, unlike the Sleep spell, doesn't mention only affecting level 3 and below critters, and it has a different save (wands for the wand vs death with a -3 penalty for the spell) so I figured that it might be useful later on in the game when the spell has become useless and bought the wand from high hedge.
As far as I can see though, the wand has no effect on powerful opponents, can't see any save rolls in the log so presumably it has the same restrictions as the spell.