figment of (one's)/the imagination

An experience that initially is thought to be real but is actually imagined. I thought I heard the sound of my front door opening last night but it turned out to be a figment of my imagination.

Common Names:

Name	Pronounced	Usage
Aristeidis	-	Greek
Angelle	-	English (Rare)
Sela	SEE-lə (English)	Biblical
Kelia	-	English (Rare)
Fabiola	fah-BYO-lah (Italian), fah-VYO-lah (Spanish)	Italian, Spanish, Ancient Roman
JoÃOzinho	-	Portuguese