"You cannot sleep?"
"No, not exactly. I don't want to sleep."
"Indeed. Is that not rather... unusual... given our previous activity?"
A soft laugh. "Yeah, I guess it is, now that you put it that way. But if I sleep, I won't be aware of right now. Of being held by you, feeling your body surround me. I want to keep this forever."
"I suppose. But I still want to keep it." He turned to Spock. "If I should ever lose you..."
"You will not; sleep. And if this moment escapes us, we shall create a new one tomorrow."