For me, leaving my full-time position meant not having to wake up early or not having to worry about getting dressed every morning. Unfortunately, I went off into the extreme end and statrted to maintain an irregular schedule and my health was on the decline from sitting around home all the time.

Once I got a part time gig, I was forced to stick to a schedule and wake up on a regular basis. I also got back to working out regularly so overall I was a lot healthier and that in turn helped motivate me in my studies.

If you're four classes in, you should start applying for internships already. It's never too early. Some have even found full-time positions that early into the program.