Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Since the sleepy Pokemon in Niantic’s sleep-tracking app are not interested in fighting each other, their Natures only affect their helping stats.
Source: https://gamerant.com/pokemon-sleep-all-natures-effects-guide/