What is the circadium rhythm?

Answer 1

It's actually the circadian rhythm-with an 'n' not 'm'. It is a mental, physical, and behavioral change within a 24 hour cycle depending on what the organism does between the day and night time. Simply put: It's how you act/think/feel throughout the day and night within the 24 hour day. For example: When you see light in the morning you know it's time to wake up and you feel energized (for morning people) and during the night you know it's time to go to bed.