Glorfindel almost allows himself to be lulled to sleep by it - comfort and calm are in short supply. But he knows how tired Elrond is, and how sorely injured - part of his (admittedly often self-imposed) duties as protector is protecting Elrond from himself.

And from that thrice-damned ring.

Wincing as he forces muscles that have gone stiff to move he pulls himself out of his chair, going to Elrond's side.