Dreams are important for your brain to do it's brain shit. Integrate memories, work out subconscious things, deal with the what-the-fiyling-fuckishness of being an ape that has an over-developed cognitive realm. Lack of REM makes your mind angry, and can literally kill you. How do you think hijacking such an important process which has evolved over millennia to do menial office work will go? Let's ask taste receptors and high-fructose corn syrup...