I think i have internet/porn addiction and sleeping problems. does one cause the other?

Internet porn addiction: Can especially lead to a sleep disorder if you stay up too late at night looking at the computer screen. That will shift your sleep cycle and cause a delayed phase sleep disorder, which is where you fall asleep even later at night because your melatonin levels have been altered. Basically the computer screen becomes your brains zeitgeber or time indicator that sets your biological rhythms including your sleep time via melatonin secretion.