[Garrus shakes his head, awkwardness fighting with sympathy for something that sounds rather personal.]

Uh, no. I mean real sleep. Falling asleep next to. It's the...

[He knows what word fits best. He tries to find another, to dance around the accurate one, but there isn't anything suitable.]

The intimacy of it. There's no time when you're more vulnerable. And considering the way the city works, I don't think it'd be safe to restrict an act.