You know another reason could be the altitude...It feels like you are drunk trying to concentrate at that altitude. Sometimes you have to stop for a few minutes just to catch your breath. You see stars if you engage in any kind of heavy activity.
Dreaming of Dakar
Everyone has a max speed, 90% of that max speed is much safer and easier, and if that 90% speed isn't fast enough at Dakar, you enter the snowball. - neduro