When it's obvious that they're both falling asleep on the couch he turns the television off and nudges Clint's shoulder.

"Come on, bedtime." Phil stretches his arms over his head afterwards but waits until Clint's sitting up before he stands. He kisses the top of his head on his way to the bedroom and bathroom to get ready for bed.

If Clint doesn't follow because he needs that space Phil will be a little disappointed. He's found he likes sleeping with someone else in the bed. Probably because it's Clint there.