I believe the physical body is meant to serve as an insulator and those of the NDE, having breeched the walls, may find it difficult to return/remain completely "inside" their corporal form. Personally, I sensed a "hovering" (accompanied with an expansiveness) that resulted in a hyper-emphathetic/energetic response which can be disconcertingly painful at times.
There are meditative techniques which, rather than promote leaving one's body, help anchor one's awareness in the center of their head. From this vantage point, a grounding cord may then be extended to the center of the planet and situational energy (ours or others) may be consciously released.
I wouldn't be surprised to learn the reason some returnees have their watch's stop relates to an altered physio-electromagnetic grid/positioning (seat of consciousness) upon one's return from a NDE. Included in this nifty little package may oftentimes be found a spontaneous release/opening of one's Kundalini and the energetics, even more amped up, can leave one with a sense of overload. Personally, I call this element of overwhelm, "Post Traumatic Death Disorder" and would reference it as the downside of a NDE.
On the surface, it sounds sorta nifty, but it can hurt and, if ya ask me, ain't much fun.