Black out yawning
I have noticed when I feel a little tired you know the kind of tired that is kinda of dizzy tired or just tired. When I yawn I am used to tensing up and stretching out while standing. Well over the last few months when I have a standing yawn I hear the buzzing of blood rushing out of my head, my vision fades to a minimum to the point a well lit room looks like a dim room in the middle of the night, and I lose all sense of direction for an upwards of 30 seconds. At one time when I stretched and yawned I am thankful where I landed I had almost lost consciousness because right after I relaxed my vision was completely gone and my hearing went as my legs buckled and dropped to the couch after a big yawn. Also I am every now and then getting really dizzy