When I was seventeen, I was broadsided by a road motorcycle while riding my bicycle. I woke up in the hospital with no idea why I was there. The last thing I could remember was sitting in the band while we played for a school pep rally, which would have been a full hour before the accident.
To this day, decades later, I still do not remember anything between those two points, except I think I was vaguely conscious for a bit while they were taking xrays. I don't have vague dreams of the accident. There is just simply absolutely nothing.
Tsukasa is being extremely clueless about human physiology here. And the author is, as well, I think, because Nasa is going to remember, I predict, because luv.