nightly
1. [ adverb ] at the end of each day
Synonyms: every_night
Examples:

"she checks on her roses nightly"

2. [ adjective ] happening every night
Examples:

"nightly television now goes on until 3:00 or 4:00 a.m."

Related terms: nighttime
Similar spelling:   nightlong
  night_owl
  nightlight
  Nistler