On one occasion I caught a dream in the making. At some point while falling asleep my audial perception turned off and apparently it was rewired to hear interna

On one occasion I caught a dream in the making. At some point while falling asleep my audial perception turned off and apparently it was rewired to hear internal processes, e.g. heartbeats and breathing. For a few moments it was a "textureless sound", but soon a random thought about waterfalls had crossed my mind and the sounds got texture. Imagine an overwhelming sound of waterfall modulated by heartbeats and breathing: you're aware of what's going on, but it feels so real and overwhelming, like standing under Niagara, that you're struggling to not give in to fear. When I was waking up, I caught a similar moment of half-built visual dream. I was seeing a room made of textureless cubic voxels, loosely resembling a living room layout, with a couple piles of voxels constituting armchairs, I think. However, this 3d scene was again modulated by heartbeats and breathing, so the "armchairs" were enlarging and shrinking with every heartbeat, overall resembling a fire, just made of voxels. The moment a thought with colors had crossed my mind, the voxels got texture and the room started to look indistinguishable from reality.