Waking Up On Time

I am twenty one years old and struggle to wake up for work sometimes. I work six days a week. About 40 hours. I do college online and take three classes. I work somewhat of an inconsistent schedule. Some days I work 1pm-8:30-9pm and others I wake up 6:30am to 1pm. I usually get home around 9:15pm when I close and wake up for work at 5:15 to open. Is it my inconsistent schedule that makes me late or is it just me. This is the first time I’ve ever not showed but I have been slightly late. Most is 30 minutes. I know at the end of the day I am responsible for myself but I have a difficult time falling asleep and waking up. I am always thinking about the next task I have to do. It’s just a grind that never stops and I can’t get my mind to just stop and relax when I need to.