Before I was diagnosed, I blamed myself for always being tired. I figured it was because I wasn't sleeping enough, or wasn't being strict enough with my sleep schedule, etc. I met my then girlfriend, now wife during the worst of it. I was commuting some 650 miles (or more) a week on a sportbike between work and school, and would regularly find myself waking up in a different lane, or even drifting into the shoulder on the freeway. Pretty terrifying stuff. I was also tuining her sleep because I'd stop breathing, then gasp for air and it terrified her, haha. As soon as we got married, I did the at-home test, then the sleep study. Once I got the machine, everything changed for the better. No more falling asleep 10min into my commute on a bike anymore!
The downside is, it makes renewing my flight medical every year a real pain in the ass, but it is what it is.
Long story short, it changed my life! My current machine is old and needs replacing (it's noisy now, whereas it wasn't when new), but it's been a serious godsend for us. I became a whole new person when I finally started to actually sleep at night!