Sleep is essential to health and well-being. Lack of sleep can lead to impaired memory, slowed speech, and inability to multitask as a person becomes sleep deprived. As sleep deprivation worsens, microsleeps can occur where a person briefly nods off while engaged in activities like driving or reading. Stress is a common cause of short-term sleep problems, while untreated sleep issues, medical conditions, and an irregular sleep schedule can also disrupt sleep. Risks of drowsy driving include late night driving and obtaining less than six hours of sleep per day.