Without a way to do coffee breaks, you need to organize your time to keep yourself productive. One of the best-established methods to do just that is the Pomodoro technique. 

With Pomodoro, you can choose a task that you need to finish and set 25 minutes to focus on the job at hand. Immerse yourself in the task and do nothing else but the task you set yourself to finish. Take a short 5-minute break and do anything that’s not work-related.

Every 4 Pomodoro periods, take around 20 to 30 minutes to rest. Take a nap. Have your lunch. Assess what else you need to do. Repeat the entire process throughout your entire day can help keep your focus and build up your productivity. How? 

As human attention span is short, staying fully focused on a task lets you finish more through the day. The 5-minute breaks are there to give you a brain break, as well as reduce eye strain.

Doing the Pomodoro technique helps you finish what needs to be done without time pressure. You give yourself something to look forward to at the end of every task, as well as a way to center your focus.