I'm planning on starting this event with as little sleep debt as possible, and a sackful of ProPlus. Carrying some impromtu sleeping kit (foil blanket, that kind of thing) as it is likely to be snatched naps, even if there is a designated sleep stop (I thought the "facilities" show a Z, which means sleep stops on route, but this may be wishful thinking or erroneous).
Not going to be easy, with the motto "time is miles" more relevant to a successful brevet than on many rides, is my anticipation (but should be fun, as it goes over some lovely terrain, if other rides that overlap with the route are anything to go by).