I did a San Diego trip, but hadn't planned on it being cold, leaving Phoenix in the 90's and going through the mountains coming into El Cajon on I8 from Alpine/Jucumba I was freezing, literally had to be in the mid 20's. Got to San Dog, bought a heavy fleece coat as a liner and better gloves for the ride back.
a note about nodding off, I used to work third shift, and was going to real estate school during the day. Rolling west on the 101Loop, in a daze completely out of it, I realize that I should have taken the I17 south ramp and ride right passed it. I try not to burn that candle anymore.