First of all we should try to find out the reasons for feeling sleepy. Is it due to overeating or due to exhaustion from playing or is it due to of lack of interest in studies? Now, if you were asked to watch a movie, then would you feel sleepy? If some of your friends were to come over to play, then would you feel so? You wouldn't, right? This implies that you feel sleepy because of your lack of interest in studying. Even in case of movies and games, you would feel sleepy if they aren't of your interest. So, please try to analyze and identify the root cause and try to correct it. Results will follow automatically. Another simple solution to overcome sleepiness would be to get up from your study table and have a glass of water that shall help you feel fresh & re-energize yourself.