lenpelletier says:
Here's the relevant ruling for future reference:
[ +- ] PHB 204
A typical spell requires you to pick one or more targets to be affected by the spell's magic. a spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect.
To target something, you must have a clear path to it, so it can't be behind total cover.
If you place an area of effect at a point that you can't see and an obstruction, such as a wall, is between you and that point, the point of origin comes into being on the near side of that obstruction.
A spell's effect expands in straight lines from the point of origin. If no unblocked straight line extends from the point of origin to a location within the area of effect, that location isn't included in the spell's area. To block one of these imaginary lines, an obstruction must provide total cover, as explained in chapter 4.
Yeah, that makes sense. I was looking it up in a pdf copy of the PHB at work, and I guess I gave up too quickly. I looked under Range on p. 202, saw that it didn't say anything about having to see the point of origin, and didn't bother to turn the page. I blame work. I'm a proofreader for the judiciary, so I'm constantly reading cases of statutory interpretation. I just kept thinking about one of the rules of statutory interpretation: if the legislature does not include phrasing they included in other statutes, then they meant to exclude that phrasing.
In other words, I kept thinking, there are plenty of spells that state you have to see the target or the point of origin. Sleep does not include that specification. Ergo, Sleep does not need line of sight to the point of origin. If I had turned the page, I would have seen that they quite clearly state that, unless otherwise specified, while you don't have to actually
see the point of origin (meaning you could still cast it in the dark or while blinded), you do have to have
a clear path.
And, yeah, it would have been kind of funny for Kit to put Pageflap to sleep. "Kit heads for the western door, stepping over Pageflap's sleeping form.
I say, Pageflap, this hardly seems the ideal time for a nap!"