On at least six occasions, both Peter and Paul encourage Christians to be sober.
I use the word “encourage”, but they actually command it; we should not view sober Christianity as optional. Nevertheless, there is no high-handedness about the instruction: in Paul’s case at least, it’s “Let us be sober.” All believers from apostles to babes in Christ need to adopt this attitude, whatever it might involve. Paul too was striving to achieve that which he commanded.
Of course, to be sober we need to have a scriptural idea what sobriety involves.