Lack of sleep is common among college students, but sufficient sleep is important for maintaining your energy levels, strengthening your immune system, thinking clearly and improving your mood. Studying or socializing late at night can also lead to altered sleep patterns and daytime napping, which can disrupt the quality of your sleep and increase daytime fatigue. Being overworked can impair sleep quality due to high levels of stress hormones. Create an environment conductive to sleep by setting a consistent bedtime, creating a relaxing nighttime routine and avoiding caffeine, nicotine and alcohol within three to four hours of going to bed.