Scenario 1: A person is dozing for short time with the light on, likely only a few minutes, and upon gradual return to his/her normal "eye vision only" consciousness, briefly "sees" the brick outlines of the cement wall BEHIND the painted drywall of the far wall. At first, the outlines of the brick seem to be being drawn in, similar to watching writing appear on the wall, then vision solidifies into whole wall being recognizable as brick wall pattern. This lasts only seconds until full normal vision/awareness returns.
Scenario 2: Again upon awakening from a full night of sleep, a person is beginning to be aware of being awake, and has not yet opened their eyes. While eyes are CLOSED, the person "sees" the corner of the room they are facing where the ceiling meets the walls. The vision lacks color and resembles more different shades of light and dark appearing in the shape of the corner. As soon as the person concentrates on this unusual occurence and tries to analyze what is occurring, the vision disappears. During this vision, the person also feels an intensity of feeling in the middle of the forehead just above the eyes, as if that spot were being touched by something that is very slightly vibrating.
Scenario 3: The person awakens in the night after unknown length of time sleeping and with eyes CLOSED, watches, in a dark room with no lights on, a darker shaded human shape walk past the bottom edge of the bed. The person is awake enough to be consciously aware of this, but falls immediately back to sleep, and recalls it clearly in the morning.
Scenario 4: Upon waking up from dozing on a couch, the person looks towards an electric fireplace that is radiating heat. This time with eyes open, the person sees the heat waves radiating out of the fireplace towards them, almost exactly like the effect when a person observes heat waves on a hot summer day pavement. This lasts only a few seconds until the person is fully awake and wondering how they could have seen what they just saw. This scenario is different than the others since it seems to be the heat waves themselves that is being perceived, and not a solid object.
In all scenarios, dreaming is ruled out by the person due to lack of "non-real" elements and simple recognition of the occurrence as not a dream.
I'm looking for answers to explain seeing physical objects/heat waves these ways. The person is trying to make sense of things and see if they can figure out what is happening biologically to cause these different kinds of perception during between wake and sleep transitions.
What type of brainwave is in use during this kind of sensing? I am assuming this sensing is connected to a specific type of brain wave due to the vision only occurs during a change in conscious awareness from sleep to awake. Is that a valid assumption? It is not yet known if other kinds of awareness states such as those achieved during meditation will allow this kind of "vision".
What areas of the brain would be in use during this type of sensing besides the occipital lobe?
Can a spatial recognition kind of sense be involved and somehow connected to vision sense?
Memory-created vision considered as a possibility, but doesn't seem to be the answer due to the person having never seen the brick wall behind the drywall.
Although related and considered, the subject of synesthesia does not seem to provide an explanation for this kind of sensing due only vision involved (as far as commonly known senses go, anyway).
Edits: Sound is not involved in any of these scenarios. In fact, the person is actually moderately hearing impaired, largely corrected by hearing aids.
The new sensory experiences began to occur after significant spiritual growth and existential reflection by the person, and this fact very possibly is connected to and somehow paving the way for a new sense to activate.