There are many reasons as to why you are feeling sluggish. One may be because of your diet. If you are not making an effort to eat healthy all the greece & fats just sink into your body & that makes you feel slow. Another reason you may feel sluggish is due to the lack of exercize that you may not be getting. Also, take vitamines... it will help!
There are a number of reasons that may cause the sluggishness like lack of enough sleep, unbalanced and unhealthy diet, anemia and depression. In a minority of cases, sluggishness and low energy could be symptoms of serious underlying health problems. You can solve this by getting a medical diagnosis first and changing your lifestyle.