Dream imagery refers to sensory experiences—visual, auditory, motor, olfactory, and others—that occur during sleep, most prominently during REM sleep. For most people, dream imagery is predominantly visual, often vivid and emotionally charged, and may include narrative scenes, dialogue, and physical sensation.
A common question among people with aphantasia is whether they dream visually. Reports vary: some aphantasics describe vivid visual dreams; others describe non-visual or sparse dream experience. This pattern suggests that involuntary dream imagery (generated during sleep) and voluntary waking imagery (generated deliberately when awake) rely on overlapping but partly separable mechanisms—people can have one without the other. Research in this area is ongoing; current models propose that voluntary imagery requires top-down activation of perceptual systems that may be reduced in aphantasia, while dream imagery is initiated by a different bottom-up process. Imagination Index measures only voluntary, waking imagery.