I dont really get this as time is never a reality in dreams, you say a whole day dream, ive never known about the timespan of any of my dreams or over how long they were supposed to be set
maybe you do though
but i actually read in a recent new scientist that they had succeded in Japan of recording someones thoughts for the first time. the showed a person picture of a word, and they used all the signals in the brain to map out a photo of the word just of the impulses of the brain seeing the word.
very early stages, but they say in the future 'seeing' dreams could work from the same way.