I find both time changes disruptive to my sleep patterns. I'm okay for the first couple of days then I get slammed with insomnia that limits my sleep from none to a max of two hours. I still have to get up and go to work however so I just keep going. I hope to sleep some tonight before work tomorrow. I will say last year was worse- I fell asleep behind the wheel and hit a tree. I was fine but the car was totaled.