18, 6/7 hrs restless sleep a night wake up breathless anxiety. Sleep deprived 3 yrs, mostly go to sleep after 12am. Health effects? Cancer cause?

You might consider. asking for a SLEEP STUDY which your PCP (Primary Care Provider) can arrange! There is no CANCER risk! However poor sleep can result in many other issues and should NOT be ignored! Hope this helps! Dr Z.
Obtain diagnosis. there are many possible causes for the symptoms you describe. to focus on the cause of your condition. a sleep study would be helpful as would a careful physical evaluation which includes appropriate ancillary studies.. then a specific treatment pla can e developed for you.