Went off-route and missed 2.4 miles of a small loop into Oxnard on the Triple's route when I was falling asleep and missed the L turn onto Central Ave at the "Red Wing rest stop"; I understand that there wasn't anyone there. A short "wake up" break would have come in very handy at that moment! In my addled mind I somehow (wrongly) determined that I had missed about 10.2 miles, so I made up my own little "bonus" ride back up to (and a little past) the Ventura Pier. This amounted to an extra 7 3/4 miles, and the loss of about an hour of sleep. Started at 6:08 AM, and finished at about 5:16AM on Sunday [+23:08]. I started the last 100 miles of the "double-double" at ? At about 2:52AM on Sunday, I missed the turn at mile 263.1 [20:45] where there was supposed to be a SAG stop, but I'm told there was no one there. I was falling asleep while riding, and could really have used the help there. Instead, in my addled state it took me around 2 miles to realize I was off course, and I wasn't able to figure out where I had gone wrong (with about 7.5 min. of stopped time), so I determined to get back "on course" at the nearest point and make up any difference in distance that I may have missed. Well, I somehow determined that I had missed at least 10.6 miles, when actually I had missed only 2.4 miles; as related above, I put in what was actually an extra 11.07 miles out onto the Ventura Promenade, past the Crown Plaza, and on as far as the parking area for the Ventura County Fairgrounds before heading back the same way until I rejoined the route at Gonzales and Harbor Blvd.