People say the early bird catches the . This means people who wake up do many . They also say: "Early to bed, to rise makes a man healthy, , and wise." This may be . Scientists found that people who go to bed early do better in . People who sleep and wake up early (early birds) have an over people who sleep and wake up late (night owls). They found in the of early birds and night owls.
The scientists tested 38 . They answered about sleep and tiredness. All of the people had MRI brain and did tests during the . The early birds said they felt less . They did the tests quicker than the night owls. There were big between the groups. The said night owls have to get up early for and work. They want to sleep late, so they have to fight their natural .