I used to get this feeling of detachment from reality very often when i was about 12.It came and went, starting with everything getting really bright for me, way brighter than it actually was.Then it just felt like i was dreaming and i couldnt concentrate on anything. I got it so often it eventually made me emotionally numb and it was really hard for me to communicate with people. It stopped after about a year, but its coming back again atm(age 16)