my husband has sleep apnea and it was me who pushed him to get a sleep study done.
He snored loudly but the main concern I had was that his breathing would stop and then he would cough and start all over again. Basically this causes not good sleep as there is no REM sleep.
Questions to ask your self are:
Am I snoring? (ask some one to tell you)
Do I wake up multiple times during the night
Even if I sleep 5 or 10 hours a night do I not feel rested
There's probably more that you could find on a detailed web site on sleep apnea.
Also, drinking caffeine late in the day or alcohol late at night can disrupt your self.
Good luck & I hope you can get some better sleep soon