Synonyms for Night and day:

• adv.

  •continually (adverb)
  • round the clock,
  • at all hours,
  • perpetually,
  • all the time.

Antonyms for Night and day:

• adv.

  • Other antonyms:
    seldom, intermittently, never, infrequently, unusually, occasionally, ne'er, sometimes, periodically, variously, rarely, sporadically.