He should probably get a less comfortable couch. It takes a remarkably short amount of time for Seth's consciousness to evaporate completely. And thanks to the fact that Daniel is doing the same, there's nothing to wake him up before he can get well and truly settled.

Which is probably a good thing, because then he doesn't notice as he slowly starts to slip sideways, becoming more and more tilted, until he's leaned against Daniel in a deep sleep.