Chronobiology - have to sleep

An animated model under (FlashPlayer9) to understand the fragility of the sleep regulation system and the different parameters that have to be taken into account to be able to sleep.

The balance of sleep obeys to a double pendulum system. The Circadian Pendulum oscillates according to what time it is on the internal clock, the Homeostatic Pendulum depends on the individual need for sleep and life conditions.