One of the most evident side-effects of sitting in front of computers for long hours is headaches. While some get glasses prescribed, others get advice to take regular breaks. While glasses are not the end solution, taking breaks definitely helps. However, if you really understand why taking breaks help, you'll more appreciate your body and start taking more care of it. Our body is an amazing creation. Those who are more aware of it know that you can direct energy to any part of the body by directing your attention/awareness to that part. Here's an example: Just close your eyes and feel your right palm (it's the easiest part to feel for a right handed. You can feel your left palm if you are left handed). At the same time, be aware of your breathing. Both feel your palm and be aware of your breathing. It may be difficult initially but you can easily master it. Just takes little practice and awareness. After sometime of practicing the exercise, you will notice more liveliness, more energy in the palm. You can almost feel the difference. Why this exercise? When you are working on computers, your entire focus is in the head and eyes. As a result, most of the energy and light energy get's accumulated there. When your head can no longer accommodate excess energy, it starts giving you headache. When you take a break, the energy is immediately diverted to the rest of your body and the head gets a respite. This is also true for headaches arising out of excessive thinking. It's not just computers. Our entire lifestyle at present revolves more around thinking and not physical work. As a result, the body is suffering. If you contemplate more on this subject, you'll realize how much you have been abusing your body. So get up now and do the above exercise for your entire body, not just your palm. And feel the how the body will thank you for it (Yes, you'll literally be happy!).