Maybe the reason you're too "lazy" is because you're exhausted because you have sleep apnea.

Go get your CPAP. It will change your life. It will also extend your life.

This is an interesting thought experiment for my uneducated brain. How much of your body is actually "weightless" in this situation? Or is it just a trick of the mind? Surely gravity would still affect parts of your body? What difference does fully submerged vs. floating have on this effect?

It's not the same sensation as weightless. It's a lack of pressure points anywhere on the body. It's like dropping backwards into a deep snow bank. Actual weightlessness is disturbing, if you're not used to it. This is just comfortable.

snoring does not imply that you have sleep apnea! I actually had a sleep study done, I snore but have neither apnea nor dyspnea.