These differences aren’t just habits—they’re part of someone’s biology, and these differences can be grouped into a variety ...

Chronotypes are categorized into four groups: bear, dolphin, lion and wolf. The names of these groups are all related to the animal's natural sleep-wake cycle. Knowing your chronotype could lead ...

Each person's rhythm, or chronotype, is different. According to psychologist and sleep specialist Dr. Michael Breus, there are four chronotypes, which he labels dolphins, lions, bears, and wolves.

Most people fall into one of four main chronotypes: lion, bear, wolf, or dolphin. Let’s break them down, plus learn the best time to work and go to bed depending upon your chronotype. Dr. Jade Wu, ...

Each person's rhythm, or chronotype, is different. According to psychologist and sleep specialist Dr. Michael Breus, there are four chronotypes, which he labels dolphins, lions, bears, and wolves.