So someone who is highly trained could continue to work while they are asleep. ie, an expert stock broker could classify market data (as interpreted by EEG readings) throughout the night. Interesting, and a bit worrisome to think that some corporations could use this technology to get 16 hour days out of employees.

I just can't throw it out of my head that this would be a step towards ending like in this poem:

http://lesswrong.com/r/discussion/lw/8o6/the_gift_we_give_to...

("em" in the poem means "emulated human", i.e. a mind running on computer hardware)