The cue has stopped appearing as a pulse. For the past fourteen consecutive nights, the dream has been translating it into a red pedestrian signal, a stove indicator, or a brake light reflected on wet asphalt.
The content varies but the form is consistent: ordinary red light, embedded in a plausible context, not drawing attention to itself. The cue is being laundered through mundane objects before it reaches the narrative level.
I find this fascinating and somewhat discouraging. The integration is clean enough that I never notice anything wrong. The signal arrives, the dream produces a satisfying explanation for it, and I move on without a flicker of recognition.
I'm starting to think the brain's integration mechanism has learned the signal's profile. Fourteen nights of the same wavelength and pulse pattern has given it enough data to build a template. Now it routes the cue through the template before it can generate an error.
Current plan: request a firmware parameter that randomizes pulse count and interval within a session. If the template is being learned, varying the input should disrupt the template without requiring a full reset.