
Be seeing/hearing things
Illusion Perception
Used when someone thinks they see something unreal or non-existent, often from surprise or shock.

After the magic show, I was seeing things all evening.
Not Literal
The phrase isn't about actual visual abilities but perceptions influenced by mental state.

I've been so sleep-deprived that I'm starting to see things.
Informal Expression
Mostly used in casual conversations, rarely in formal contexts.

When I saw the deal price, I thought I must be seeing things.
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