Sleep behavior of the students from military medical university

The problems of sleep behavior were studied with the Sleep Behavior Inventory among 143 military medical students of second and sixth grades. The results showed that the students of the second year with sleep disor ders account for 50.0% and the sixth 42.2%; all of sleep disorders were apparently difficult of the sleeping process and had the ratio of sleeping time to laying time decreased; it was more difficult for the sixth to keep asleep than the second; while the second were more sensitive to wakefulness; the difficulty in going sleeping was an important factor to influence the self-assessment on sleep quality. The habit for nap-taking plays a significant role in decreasing the ratio of sleep disorders.