If impressions (vāsanā) suffice to generate fully determinate perceptual-seemings in dreams, the Yogācāra position regressively presupposes the very external objects it claims to eliminate.

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External objects(what realists believe we can perceive): Things that exist outside your mind, independent of whether you're thinking about them—like tables, trees, or other people.
Yogācāra(Buddhist philosophy debate with realism): A Buddhist philosophical school that argues against the reality of external objects, here described as mounting defensive arguments against realist challenges
impressions (vāsanā)(used to explain how dreams can feel vivid and real): In Buddhist philosophy, mental imprints or residues left by past experiences that influence how we perceive things, even without external objects present.
perceptual-seemings(used to describe dream experiences that feel like perceptions): The way things appear to our mind or consciousness—what it's like to see or experience something, whether or not that thing actually exists.

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