Most people notice that their sleep changes as they get older. Teenagers often stay up late, adults may struggle to get enough sleep because of work and family obligations, and many older adults find themselves waking before sunrise. These changes are not simply habits—they are largely driven by your circadian rhythm.
Your body follows a natural 24-hour internal clock known as the circadian rhythm. This biological timing system influences when you feel awake, sleepy, hungry, energetic, and even when your body releases hormones. While many people think of their sleep schedule as simply a habit, your circadian rhythm is deeply rooted in biology—and it changes significantly throughout your lifetime.
Understanding how your body clock evolves can help explain why teenagers struggle to wake up early, why older adults tend to rise with the sun, and how maintaining healthy circadian rhythms can improve overall health.
