Circadian Rhythm

Definition

A circadian rhythm is an internal biological clock that regulates the sleep-wake cycle and other physiological processes in humans and many other organisms. It operates on a roughly 24-hour cycle and is influenced by external factors like light and darkness, helping us feel alert during the day and sleepy at night.

Example

Imagine you wake up every morning around 7:00 AM without an alarm because your body naturally feels ready to start the day. By evening, around 10:00 PM, you begin to feel tired and prepare for bed. This natural alignment of feeling awake during daylight hours and sleepy at night is an example of your circadian rhythm in action.

Why It Matters

Circadian rhythms are essential for maintaining overall health and well-being. When our internal clock is aligned with the external environment, we experience better sleep quality, increased energy levels, and improved mood. Disruptions to this rhythm, such as from jet lag or irregular shift work, can lead to fatigue, difficulty concentrating, and even long-term health issues like obesity or diabetes. By understanding and respecting our circadian rhythms, we can make choices that promote better physical and mental health.

See Also

• Sleep
• Wakefulness
• Suprachiasmatic Nucleus