What is an internal process that regulates the sleep-wake cycle and repeats every 24 hours called?

Very important cycle, that is too often disrupted by modern life pressures. Those disturbances can lead to many health problems further down the line.

Patti, this game disrupts my circadian rhythm. lol

Truck Drivers work all hours of the day. Dispatchers forget about rhythm.

Illness can make a huge impact on your circadian rhythm, too. Ask me how I know *sigh*