Seconded! I found out in my late twenties that I was waking up every three minutes, all night long. I used to sleep 10-18 hours a day if I could get the time, and was still exhausted.
I won't even nap without my breathing machine now; the difference is shocking.
I think for some folks there's something primal going on, a feeling of being trapped when things are over their faces that they can't shake. It seems like something deep-seated and unconscious, really hard to get past. I get that way if I can't freely move my arms and legs while sleeping, but the face has never been so bad.
I wish I knew some advice I could give that would help people struggling but whenever food, sex, or sleep is involved, we're still weird fleshy worm tubes twitching our way through a hostile world.
Late twenties as well. Unfortunately, my machine hasn't made a difference for me yet, which has been pretty difficult. Hopefully a solution is in my future