| This internal clock determines what is called our chronotype — whether we are morning people, night people, or somewhere in between. |
| Previous research has indicated that there may be a significant relationship between chronotype and mood seasonality. |
| Changing your chronotype takes about two weeks, but you have to stick with it. |
| According to Roenneberg, age also has a big influence on chronotype. |
| For songbirds, early risers may have a greater chance of successfully producing offspring and passing along their chronotype to the next generation. |
| It's much better to match people to schedules and structures based on their chronotype than to just force them into a schedule, knowing nothing. |
