You could also bring a sign that says "I'm only sleeping", in French, of course. Maybe write down the time you went to sleep and want to be awake on it too.
I kind of recognize the sleeping trouble though. I don't sleep well in noise (snoring) or cold, or with earplugs(I tried them all). The pressure on my ears is annoying.
The best sleep I got on LEL was in Coxwold, both times while it was light outside, so it was quiet there. I will strongly consider bringing a (waterproof in Britain) sleeping bag on future long rides. I don't intend to sleep on a 600.
Good sleep isn't necessary though, just 3 bad hours will get me through the day as well, although one should not expect me to actually think in any way.