Seriously, sleep issues are the worst. If you have them, talk to your doctor about it. I did, and they did a sleep study. Found out I had a few issues that they could address. I had some very slight sleep apnea, but that was because I was about 30 lbs overweight. I lost the weight, and the apnea went with it. I also had some anxiety issues that were keeping me from sleeping correctly. And finally, I was in my mid 20's, so I was drinking a bit. Not every night, but enough nights that it was causing me to sleep poorly for 3 or 4 nights a week.
So yeah, a lot of sleep issues are manageable if you get with your doctor and figure them out. On the other end of the spectrum, my dad has had sleep issues since he was in his 20's. He never got them dealt with. He has now done permanent damage to some of his receptors (Sorry, I am not a doctor so I cant get more technical than that) and has pretty much a permanent sleep disorder. He has been to every specialist under the sun, and no one can figure out how to fix it at this point. So they can become major issues down the road if you dont address them. He will sleep for 5 hours a night, and then go for about a week with almost no sleep. Then, he will crash and sleep for 3 or 4 days. It goes in cycles kind of. It leads to a lot of mental health issues as well, as you need consistent sleep to maintain good mental health.