Only one additional hour of sleep a week can increase the motivation to work. Scientists believe that a rest may even affect wage growth.
Should be given sufficient time not only work but also recreation. Without a full night's sleep and desire to work for result quickly disappears and turns into a scheme to "come to work to faster to escape it". Researchers have established that just one extra hour of sleep affects wages on a par with the year at an expensive University with a quality education.
Note, in the winter, the drowsiness increases. That is why always sleepy in the winter people need more time to sleep to feel good and cheerful in the morning. There is nothing to worry. It is better to try to live in harmony with your body than try to squeeze out all the juice, putting additional stress.