I have the weirdest internal clock, people. It is set for me to be awake at night and sleep during the day. I have done all I could to re-set it but the success has been minimal. No matter how sleepy and tired I might feel all day long, at 10 pm, I magically come wide awake. And stay on full alert at least until 5 am. It’s been like this for years and years.
It doesn’t bother me a whole lot because I don’t have the kind of job where I need to be at work at 8 am every day. I’m just curious why this happens. Might the reason be that I emigrated from one continent to another and still live in the time-zone where I was born? If you also emigrated with a significant time-zone change (six, seven hours), do you have a problem with your circadian rhythm?
Other than this, my internal clock is very good. I can always tell exactly what time it is, with the precision of about 5 minutes, even after I wake up. It’s just this annoying nightly wakefulness that bugs me.