meditation

Finally, spring(summer?) has come here. In these days, I am doing meditation when I feel tired. I lie on my bed with my palms facing the ceiling and relax, then I imagine the heat is on my right hand. The heat source is getting warmer and warmer, it becames a fire ball and it is floating, not too hot just very warm. Then I throw it to my left hand softly. Then my left hand starts feel warm. Then next I feel the same way on the right foot and left foot. After this I fall asleep immediately. I take 10-15 minutes nap for charging.