One thing I regularly do when studying is listen to music. Experts say "no distractions eg. no music, computer, phone" and I agree with most but when I listen to music that I enjoy, I loose sense of time and just study for hours on end and enjoy it at the same time! Not sure if it works for everyone though
Actually, I have found then when I used to have to study, music in the background at the right volume did actually help me out. It's almost like playing music I liked got me more interested in what I had to learn at the time, if that makes sense.