Imagined

DREAMT

["Think of what you might have done last night while sleeping."]

The clue "Imagined" leads to the answer "DREAMT" through a straightforward definition. The word "imagined" means to form a mental image or concept of something that is not real or present. Similarly, "dreamt" is the past tense of "dream," which can mean to think or contemplate, especially while in a happy or hopeful state of mind, or to envision something in your sleep. Both words involve creating mental pictures or ideas, so "imagined" directly points to "dreamt" as a synonymous past-tense verb. There is no specific wordplay, pun, or cultural reference in this clue; it is a direct definition.