Insomnia
The Pokémon is suffering from insomnia and cannot fall asleep.
Forewarn
When it enters a battle, the Pokémon can tell one of the moves an opposing Pokémon has.
It remembers every dream it eats. It rarely eats the dreams of adults because children’s are much tastier.
When it twitches its nose, it can tell where someone is sleeping and what that person is dreaming about.