Ok I have Sleep apnea, and am a respiratory therapist. The issues with sleep apnea and any Bariatric Surgery is bigger than it will go away after we lose weight.
Yes most people's sleep apnea is atributed to weight but a great deal of people who are thin have it too.
When you are sedated and have pain medications this also induces sleep which can be hazardous to your post op recovery if your sleep apnea is not treated. It can cause increased abdominal pressure and put you at greater risk for leaks. Sleep apnea often causes your oxygen levels to decrease to dangerous levels, this prevents your tissues from getting the much needed oxygen to heal.
Yes, many people go through surgery without a CPAP and do fine, but many do not.
I know I am not willing to risk it. My machine will go with me to the hospital and I will gladly wear it until the weight comes off. I sleep great with or without the machine, never had a complaint about being tired all day or stopping breathing or anything else. Mine was found accidentaly 3 years ago when we where testing new equipment at work and I was 60 lbs less then than I am now.
Not meaning to scare or preach, just wanted you to know it's more important than people often realize.
Good luck on your journey and much success.
Tracey