Nighttime Caffeine Increased Impulsivity Through Dopamine in Fly Study
A 2025 iScience study found that nighttime caffeine increased motor impulsivity in Drosophila, with dose-dependent loss-of-inhibition events across n = 30-32 flies per behavioral condition and stronger effects in female flies than male flies.1 The result does not prove that an evening coffee makes humans reckless, but it sharpens a neglected point: caffeine’s alertness benefit …
