Taking time out throughout the day will make you overall much more productive.
It is really important to seek balance in your life. I have been stuck on the computer all day so I decided to spend my lunch breakout outside and connect with nature and do some stretching. If you are working a lot, taking time out a couple times a day just to get a quick breather and to reset your mind will make you so much more productive overall. There is nothing worse than the feeling of being brain deal all day when you have deadlines looming.
Sometimes we have to stop and smell the roses.