lucubration

lucubration / loo-kyoo-brey-shuhn/
–noun
1. laborious work, study, thought, etc., especially at night.
2. the result of such activity, as a learned speech or dissertation.
3. often, lucubrations. any literary effort, especially of a pretentious or solemn nature.

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I often stay up late, trying to work, study and think, but it's seldom laborious. None of the results are learned or solemn, but sometimes they're pretentious.