I don't ever really feel tired, but I never seem to sleep 8 hours a night anymore. I work from home so I tend to not have a normal sleep schedule being I don't have to wake up early to go anywhere.
I tend to go to sleep around 4 to 5 am and I get up at 10 to 11 am everyday. It doesn't matter if I go to sleep earlier I still always wake up after about 6 hours.
The only difference is, I notice I get more done if I wake up early in the morning. Meaning if I wake up at 6 or 7 am I seem more likely to get stuff done, than if I wake up at 11am or later even if I slept ther same amount of hours.
I can't complain really as I have almost 18 hours a day to do what ever, but I wonder if any others are the same way?