I have sleep apnea and I use a CPAP. I have had it for a year and I still wake in the night in a panic because something is on my face! Really embarrassing.
Anyway, the CPAP does help. I have lost a lot of weight (50#) but that has not improved my sleep apnea or my hypertension. I guess each person if different. I may also need to lose a lot more, too, to night a difference since I am still in the obese category.