If I was fast enough to get 8 hours of sleep a night, I would get 5 hours of sleep a night and spend 3 hours a day in cafes and stopping to talk with locals. Okay, I did spend 3 hours stopping to talk with the locals and it got me behind on the clock, so it probably was a bad idea. Not to say I would change it though.
You can close a control, nobody is keeping track. If it were a domestic 1200k, they would know but they wouldn't care. On PBP, there is no way to know without scrupulously investigating your start time and they don't even do that when you show up to get a stamp upon incoming. The main problem is there are always 2 secret controls. And they are almost always right after Loudeac. If you are going fast enough, don't stop at Loudeac to sleep. Stop at St Nick outbound and Quedillac on the return. If you are a normal human, Loudeac is a great place to stop for sleep on the outbound and the retour.