the only studying that you could use i think is math in dreams becouse 1+1 should always = 2. but math can be evil for there is a way to get a 8x8 square with area of 64 to be come a 5x13 rectange with area 65 i know why but it is not an exact science. but studying can get very hard in dreams for you could make ups stuff like there was a pesident called george bush and stuff like that