I have crashed a few times before and still remember them in almost second by second detail, like they were in slow motion but this time was very different. I had ridden to Tuktoyaktuk and was heading south, I had completed 1000 of 1100 miles of gravel travel and had the best conditions of my time on the gravel. Hardpacked almost pavement like conditions, warm and I'm excited because I only had another 100 miles of gravel. The last thing I remember is seeing a grader in the road and then I'm standing next to the bike wondering what happened. A few riders that were behind me said I hit a berm in the road, went back and forth across the berm and went head/face first into the ground. I don't remember hitting the berm, hitting the ground, standing up and taking my helmet off or when they lifted my bike. Why did I hit the berm? When I saw the grader I knew there could be a problem ahead. Did I fall asleep? Can you fall asleep and not wake up when things start going sideways? Did I pass out? Fatigue, dehydration, other health issues? I had been on a ride late and start early schedule. Concussion? I did hit my head and had a headache for a few days but I don't think it was a hard enough hit to cause a concussion but I don't remember hitting the ground. Anyone have this happen? No memory of the crash. If there weren't other people to tell me some of the details I would have had no idea what happened here. I don't know if the bike ended here or if they moved it off the road. Most of the damage was on the left side. I had an injured left elbow and a sore and swollen left hand, wrist and knee. I think I was lucky.