How do you concentrate harder?

for me to concentrate, i normally try and meditate before i go to bed. it takes me about an hour to fall asleep anyways so i lay there in the silence and close my eyes. then i clear my mind and breathe. now, levitating and becoming invisible is a whole other process. yes it does include A LOT of meditation and concentration..and practice.. lets start this by asking a simple question. have you ever had a dream where you fall of a cliff, or is suspended in the air but come crashing back down and the force is so much that it wakes you? then you my friend, have already levitated. your subconcious is stronger then your alert being.i myself have not started to learn that, but i can help you be invisible so to speak. idk your particular gift, but mine is control. and to become invisible, you must be able to control everything ingeneral. lets say your alone walking down a dark alley(for reason im not sure) but then you see two big men walking your way and you panic, fearing what they might do to you. search for something to hide near and calm down. focus the gift of control to not be seen by them. i dont believe you could ever truely become invisible, but this is what i know so far. then again i myself am still a beginer. i know it sounds crazy and that hiding is just hiding, but all the hiding is doing is calming you down. not being able to see who the posible attackers are helps put your mind at ease.