Biological Clocks and Chronotypes: Why We’re Different
The human body operates on circadian rhythms—an internal biological clock that regulates sleep, alertness, body temperature, hormone levels, and cognitive activity throughout the day. External factors can also affect the quality of rest, such as whether a full moon impacts sleep quality.
This mechanism shapes our chronotype—a natural tendency for individuals to be more active at certain times of the day.
People can generally be divided into three groups:
- “Larks” – wake up early with little effort and experience peak productivity in the morning.
- “Owls” – find it harder to get up in the morning but have higher concentration and energy later in the evening.
- Intermediate types – make up the majority and do not fit into the extreme categories.
Chronotype is partially genetically determined and changes with age. Teenagers and young adults tend to have a later rhythm, while older individuals often develop a tendency to wake up earlier.
This is why the universal advice to “wake up at 5 AM to become more productive” doesn’t take into account the biological differences among people.
Productivity and Early Rising: What Research Shows
Professor Christoph Randler from the University of Tübingen notes that individuals with a morning chronotype often demonstrate better academic performance and more consistent daily habits. They adapt more easily to the standard work schedule, which typically starts in the morning.
In contrast, those with a late chronotype frequently experience what is known as “social jetlag”—a mismatch between their biological rhythm and societal demands. This can lead to fatigue, decreased concentration, stress, and sleep disturbances.
As Christoph Randler explains, this doesn’t mean that waking up at 5 AM creates an advantage. The advantage arises when a person’s schedule aligns with their natural rhythms. If an “owl” starts their day too early and suffers from chronic sleep deprivation, their productivity only declines.
In fact, the key factor for effectiveness is sufficient duration and regularity of sleep, not the specific hour of waking up. On the contrary, .
Owl or Lark: How to Determine Your Chronotype
To identify your own chronotype, pay attention to several signs:
- When do you naturally wake up without an alarm?
- At what times of day do you feel the clearest mentally?
- Do you find it easy to fall asleep early in the evening? If you have difficulties, it’s important to know .
- How do you handle the transition to daylight saving time?
Observing your own rhythms without external pressure can help you understand when your body functions best. Additionally, you can learn to better adjust your sleep and activity schedule.
Completely changing your chronotype is nearly impossible. However, you can make slight adjustments to your routine: a consistent bedtime, exposure to morning light, and reducing screen time in the evening can help shift your rhythm within natural limits.
The conclusion: it’s not the hour that determines effectiveness.
Waking up at 5 AM can be a great solution for those with a morning chronotype. But for others, it poses a risk of sleep deprivation and decreased productivity.
A scientific approach to productivity lies not in mimicking trendy morning routines but in understanding .
The best schedule is one that allows for adequate sleep, maintains a stable routine, and aligns with your natural energy peaks.
