Same story, only found out much later in life (around 40).
The thing is, now I can easily get by on 4 to 6 hours of sleep, and unless I'm truly physically and mentally exhausted I'm not even able to sleep for 8 hours because I'll be wide awake after 6 hours, tops.
I have no idea whether that is my natural sleep pattern, or just because I've spent decades "training" myself to get by on less sleep because of the apnea.