The ingénue police are at my door.

Is this Melissa Errico? The actress? Do you understand that Sharon in “Finian’s Rainbow” should be around 27 years old? Would you please come with us?

Then I wake up.

Sleeping actors are known to forget their lines, or what play they are in, or where their pants have gone. When I was offered the chance to perk up my curly curls and scrub up my Irish brogue to portray the fairylike Sharon McLonergan in a coming Off Broadway revival of the musical “Finian’s Rainbow,” this version of the actor’s dream crept into my subconscious and made plain thoughts I was already thinking: At age 46, when does an ingénue hang up her ponytail? When is it time to stop dancing with leprechauns?

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