
The average HP roll is about 20 when used as a first level spell. Useful against kobolds (5 HP), and to a lesser extent goblins (7 HP). DMs seem to be using max HP for creatures, so it's little use except for injured monsters. Even when they are weakened, the front liners could likely take them out with a single swing, or could be taken out with Magic Missile anyway. I not complaining mind you, at least it's not as worthless as Color Spray with its 1 round duration, or worse yet, Sleep could be a concentration spell.
As stated in the OP, my concern is with it being leveled against single creatures, particularly those who would be most vulnerable (like casters). As others have treated it as essentially an all-or-nothing damage spell that either wipes out a foe's current hit points, or does no damage at all, I'll run with that. Pretty effective in that respect, having no attack roll or save, and good damage for single-target DD. It's actually pretty potent, provided you're targeting with it judiciously (not every creature has their HP padded with major hit dice and con bonuses). It's particularly effective against character classes, since many of them will low HP's relative to monsters.
Just always adventure with a basket of baby chickens on your back. Each has 1 hit point.
Hehe, I know someone who would consider doing something like that. I'd be disgusted with them, but then again I could think of fantasy writers who would deem it a clever tactic for their characters (Bill Willingham, for instance, would do it in a heartbeat).
It is not that challenging for organized characters to stay out of their caster's AoE's. The spell does not have to be centered on anything, so the caster puts his desired target on the periphery of the spell's effects. This is not a new tactic by any means. It's a very traditional way of using not just sleep, but also things like silence and fireballs. I'm not saying it's never an issue, mind you, but it's very manageable without meta-gaming.There is nothing about sleep that allows it to avoid allies. So unless you are super-metagaming you don't know if the fighter surrounded by goblins has 5 hp or 20 or how many the goblins have. Sure you might take out all the goblins, or you might ensure the fighter gets massive damage and dies. And you are paying a slot for that.
And by design it is always going to go after the weakest targets first, those you would not need a lot of resources to kill otherwise. It's mostly useful for cleaning up trash so you don't get overwhelmed by a horde of mooks focus-firing you but even for that there are more precise instruments.
Not exactly an I Win button.
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