Collocations for sober - adj.

be, feel, look, seem
become, get
remain, stay
She wanted a drink, but she had to stay sober.

keep sb
Only the thought of her kept him sober.

completely, entirely, perfectly, quite, stone-cold, totally
not entirely
almost, fairly, pretty, reasonably, relatively
By this time he felt reasonably sober again.

enough
At that point she was still sober enough to ask sensible questions.

clean and sober (esp. AmE)
I've been clean and sober for four years.

Sober is used with these nouns:
mood, reflection