Sleep power vs hydra

[Odysseus]

How should I deal with a wizards sleep power against a hydra?
A save for the hyrda, or a save for each head, or something else?

 

[NMcCoy]

RAW, it's a single condition that affects the creature, so it'd get one save (with its usual +5 solo bonus).

Since you asked, though, I personally like the notion of each head being targeted and saving separately, without the +5 bonus. Sleepy-heads don't get invited to the Hydra Fury party.