Merlin shrugs a bit at that.

"I suppose it's a bit peculiar, but I admit I've spent quite a long time indoors, so day or night didn't matter terribly much to begin with."

That'll happen when you spend over a thousand years cooped up in a tower in Avalon, really. The self-described biggest shut-in in all of history.

The later remark does, however, get his attention.

"Because those abilities don't seem to work quite right here?"