Dictionary

keep someone up late en · VERB

To prevent a person from going to bed at their usual time.
- Few political careers start when people are in their 70s, but Hendy is actually relishing it, although he is incensed sometimes by the pointlessness of the posturing by the opposition, which keeps him up late. "The bit I don't like is getting home at 0100 or 0200 in the morning because the opposition have been fruitlessly arguing for a long time." 2025 October 1, Christian Wolmar, “Rail Minister at the heart of rail reform”, in RAIL, number 1045, page 35:

Spelling	Features	Source
keeping someone up late	Tense=Pres, VerbForm=Part	lexicographic
kept someone up late	Tense=Past, VerbForm=Part	lexicographic
kept someone up late	Tense=Past	lexicographic
keeps someone up late	Number=Sing, Person=3, Tense=Pres	lexicographic