It's not man, really. Work and the stress that comes from my responsibilities at it, kids that make my sleep irregular, sleep deprivation because I want to do more than I have possibly time to do, slightly overweight, etc. overall I don't have a significant amount of consecutive good nights of sleep enough to feel rested in general, and this makes me very sensitive to time changes. There was a time I also didn't care or noticed, but when my nights started to become short, it started making a difference.