I used to just take quick naps or play video games on my laptop or mobile phone to relieve stress. Taking things off your stressors for a while even as simple as walking around or jumping up and down for a few seconds can help recharge myself for a bit. Now that I have more time, I walk on parks, usually playing Pokemon Go just for fun, cook a nice meal, exercise on mornings, and have a proper sleep every day or every 2 days depending on schedule. It also helps to tackle your source of stress rather than dealing with the stress itself. Having problems studying for exams in the next few days that you have to pull all-nighters? Try to study around 1-2 hours every night earlier in the week instead of cramming the night before. Lessen your idle time on the internet or TV. Make a list of things you're doing where the number of time spent can be reduced or scrapped completely and replace them with more productive things to do, or simply just rest instead of doing these things. I know these won't work for most people but it helps.