This spring I'm going to go for some brevets (the general idea is PBP next year...), but I've never done more than 260 km in one go. I've done my 200 km brevet last month (actually turned out to be more like 250 because I rode to the start and back home) and I was feeling great even at the end, so I think I'm ready for longer distances. I'm not too afraid by the 300 km Brevet in a couple of weeks, however the 400km starts freaking me out, mostly because I've never done a whole night on my bike (never really rode on unlit roads as well!).
First, on the lighting side, I'm thinking about going with one of the new superbright cateye lights, like the EL500, plus a headlight for map reading. Would that be enough? I want to get a hub dynamo for next year, when I'll be doing more night cycling but I can't really afford it right now.
And second, how do you make it through the night without falling alseep? Is it better not to stop, or to have a short sleep? When do you eat and what?