Super flexible biological clock - I dont get jetlag - at all. I can fly half way round the world non-stop and get off at the other end and just carry on with my day, go to sleep when its night time at my destination. I also find shift work really easy, as long as I get some sleep at some time before or after I'm good. I can also turn sleeping on/off as required. I should have had a job that required a lot of travel