I use a bi-pap machine, a C-PAP machine w/2 levels of air pressure, and I love it! It has greatly improved my sleeping through the night , and consequently has improved my energy level during the day also.

I like to read at night before I fall asleep so the mask I use is the "nasal pillows". It allows me to read and is not confining during the night. Give it a try.

Good luck!