I read an article that stated your most effective periods of learning are done in 45-60 minute intervals followed by a short break. I've adopted this routine and noticed that it does actually help. My study sessions are one hour long followed by 10 minute breaks. These short breaks are when you stand up, stretch, grab a quick bite to eat. To fight procrastination, do not negate your attention from studying in that hour. Pee breaks, thirst, hunger, social media, do that all before you study. These short breaks allow you to relax, and can keep the long term study session feeling fresh. Studying too long at once will start to take a toll on your brain and your critical thinking will begin to suffer.
Stop listening to music while you study. It's distracting and counter productive. If you must have background noise, I recommend white noise, pink noise, or brown noise. The linear sound of static helps drown out the chaos of your thoughts and only think about what you want to think about. I use pink noise exclusively when I need to study effectively.
Write your notes by hand, do not type them on the computer. This is more important in the classroom than actually studying, but it's still a great thing to know. You will remember information better if you write it by hand.
There's a program you can download that will actually block websites for a period of time that you can adjust. The best part is even if you uninstall it, those websites will still be blocked. This will keep you from being able to check Facebook for the time that you have set.
Keep your study area clean and tidy. Dirty dishes belong in the sink. Half full bags of chips go in the cabinet. Trash goes in the trash. Even better, go the extra mile and clean the entire room.
This one is just personal preference, I recommend you buy a specific pen or pencil. One that you have invested in and you enjoy using. When I have to fill up pages worth of stuff, it's nice to use a pencil that I spent a little extra money for, and feels good to use.