Sleep Chronotypes: Are You a Lion, Bear, Wolf or Dolphin?

Four chronotypes: recognise your rhythm and adapt your routine

Each chronotype has a unique release curve for cortisol (the stress hormone that wakes us) and melatonin (the sleep hormone). Here is how to optimise your day for your type.

1. Lion (early type)

Lions make up about 15–20% of the population. They naturally wake before sunrise, full of energy and ready to act. Their productivity peaks in the morning, but the “get everything done by lunch” approach has a cost—by evening Lions are completely drained and at risk of emotional burnout .

• Work: do your hardest, most analytical tasks between 8:00 and 12:00.
• Caffeine: avoid coffee right after waking (your cortisol is already high). Have your first cup around 9:00–10:00.
• Mistake to avoid: do not schedule important meetings or high-stakes decisions after 16:00. By then your brain is already preparing to rest, so the chance of errors rises.

2. Bear (daytime type)

This is the dominant chronotype, covering about 50–55% of people. Bears’ internal clocks sync well with the sun. The traditional 9–5 workday is built around this type—even though it does not suit everyone’s work–life balance . Although Bears adapt easily to social norms, they react strongly to lack of sleep and energy-draining habits .

• Work: your peak is from 10:00 to 14:00. In the afternoon (around 14:00–15:00) you will almost inevitably hit an energy dip.
• Caffeine: the best times for coffee are 10:00 (to sustain focus) and 14:00 (to get through the afternoon slump).
• Mistake to avoid: avoid “social jet lag”. If you get up at 7:00 on weekdays but sleep until 11:00 at weekends, Monday hits your body like a time-zone change.

3. Wolf (late type)

Wolves make up about 15–20% of society. For them, morning wake-ups are a physical ordeal because their brains come online much later. Wolves are often wrongly labelled “lazy”, when in fact their biological peak has simply shifted into the late afternoon and evening.

• Work: until lunch, stick to mechanical, low-effort tasks (replying to emails, sorting documents). Schedule your most important work from 16:00 onwards.
• Caffeine: morning coffee is essential for you to clear the fog of sleep inertia.
• Mistake to avoid: do not condemn yourself for poor morning performance. If you can, arrange a flexible schedule with your employer and start the day at 10:00 or 11:00.

4. Dolphin (sensitive type)

This is the rarest (about 10% of people) and most complex chronotype. Dolphins are naturally alert, their sleep is light, and they often struggle with insomnia. The name is no accident—real dolphins sleep with only one brain hemisphere so they stay aware of predators. The nervous system of this chronotype works in a similar way.

• Work: your energy fluctuates, but you focus best from 15:00 to 21:00.
• Caffeine: your nervous system is already highly sensitised. Strictly limit caffeine or switch to decaf.
• Mistake to avoid: do not exercise in the evening. Physical load sharply raises your cortisol, making it very hard to fall asleep. Move workouts to early morning.

Fighting your biological clock is like swimming against the current—you burn huge amounts of energy and barely move forward. Once you understand your chronotype, you can reorganise the day so work unfolds more naturally and with less strain. Take the situational sleep chronotype test and discover your true productivity window.