Meditation is the game of power of concentration. Greater is the power of concentration, deeper can be the meditation. It helps in relaxing both the brain and the body. There are a number of ways to meditate, but the one which I have found effective is as follows.
Step-I Do around five to ten minutes of stretching, when stretching stretch your muscles as strongly as possible.
Step-II Lie on a couch/bed and raise your hands above your head. Join both your hands and try to pull the upper part of your body(shoulders and above) ,up, simultaneously pulling the lower part of body, down. Try to stretch the whole length of back bone as much as possible
Step-III Keep lying with your both hands and legs in the most comfortable position(what ever position is most comfortable for you). Now try to feel the effect of gravity on your body. Initially one may start by feeling the effect of gravity on different body parts like legs, arms, fingers, hair etc. graduating onto feeling the effect of gravity on the whole body. Just try to feel how much the gravity is pulling your flesh. Take long and deep breath.
When getting up, get up slowly. Initially sit for a minute or two, then stand up and resume normal.