I was really impressed with the idea that somebody falling into cold water will involuntary do a "gasp" for air and there by get water into their lungs. In my own experience that's sure been true. I guess I always figured that, what with everything that was going on at the time, I forgot to hold my breath when I went under.
Now the Coast Guard tells us that it's a normal involuntary reaction. I do know that with water in my lungs I'm not doing much of anything but trying to get the water out and air in.
Here at home, I can think that if such and such happens, then I'll do thus and so........yeah, well maybe....but I find that events have a way of taking charge over my optimistic plans.
As far as the idea that PFD's being restrictive and uncomfortable; I do believe a coffin is probably going to prove not all that comfortable over the long haul.
Best Wishes, Rob