Circadian Cycle

Everybody has an internal biological clock which is known as circadian cycle. That's how you know what time of the day it is (roughly) and how you develop jetlag although you force yourself to sleep a lot. An ingenious creation by itself, it has a receptor in the eye (near where all other cones and rods are), which feeds an electrical signal to the circadian system that in turn transcribes and translates a gene product. In short, it can be calibrated. (That's why going out into the sun when you travel to a different time zone is a good idea.) But what if the calibration is slightly off, say, running by a total of 23 hours a day instead of 24 (who on earth sets the number to be 24 hours anyway)?

Anyway, that's what happening to me right now. Each day, I feel tired and go to sleep earlier in the day (From 12pm to 11pm to 10pm...) and then, the next day, I wake up earlier (from 8am to 7am to 6am). Right now, my calibration for waking up is 5am, which explains why I'm here typing this post. Ok back to preparing for lab presentation.