My experience has been, "this works -- kind of -- but it is not sustainable, difficult to break into, difficult to maintain, and in the end you will have sleep

My experience has been, "this works -- kind of -- but it is not sustainable, difficult to break into, difficult to maintain, and in the end you will have sleep debt and/or suffer in overall cognitive function." I took this as, "4 hour nights are for code sprints and burning man."