From my personal experiences and the experiences of others who attempted this as minors (which may make it more difficult or easier -- it's hard to say), there's about a 0.5 chance you'll be able to make your sleep cycle just about whatever you want. The other 0.5 results in you struggling to sleep and then collapsing from lack of sleep pretty continually. Also: there is a high probability you will have a craving for grapes. No one is sure why this happens, but our guess is that it's healthier to indulge this craving.