For many of us, we are constantly going. With laptops and smart phones, we are never really able to leave work behind. We are constantly checking e-mails or receiving phone calls or making lists of the things we need to do once we are back in the office. We are not giving our bodies and minds the rest, relaxation and recharging we need to be at our best.
I am as guilty as the rest...I am constantly checking my work e-mail or hopping on the database to see how the day is going while I am away. I receive and return phone calls on my off days and haven't taken a day completely away from work for longer than I would like to admit (and this was only because I was out of cell phone coverage). No matter where you work, there are always going to be coworkers who do not respect time off, do not take enough time off themselves and assume everyone is going to answer the phone when they call. Don't fall in to this trap. There is a reason voicemail was invented.
Instead, make sure you are giving yourself the time off you need. Turn off the phone, kick up your feet and read or listen to music or go out to dinner or go see a movie or do whatever it is you find relaxing. There are very, very few things that could happen at work requiring your attention on your time off. In some situations, this may not be possible, but you have to build time into your schedule for you. We are never going to be able to do our best work unless we give our bodies and our minds a chance to recharge. Take time for you and let things go. It's the only way to continue to do your best work.