The spoken usage of "night" as an off-the-cuff, acquainted version of "fantastic night" (wishing a single a restful slumber) is frequent, but I am not sure what the right composed equal is - if there is just one. I have constantly made use of 'Night with the apostrophe, ordinarily capitalized: https://deanwjuyj.liberty-blog.com/38073761/a-review-of-night-gangnam-퍼펙트가라오케-karaoke-guide