Hypersomnia is a condition causing excessive day time sleepiness or prolonged night time sleep.

Causes
The causes are not always known and possibilities include:

• Sleep disorders like narcolepsy or sleep apnea
• Problem with autonomic nervous system
• Drug or alcohol abuse
• Head trauma or injury
• Tumor
• Certain medications
• Certain conditions like depression, chronic fatigue syndrome, epilepsy, hypothyroidism, etc.
• Obesity
• Hereditary

Symptoms

• Prolonged night time sleep
• Frequent day time naps
• Unrefreshing sleep
• Fatigue
• Anxiety
• Irritability
• Inability to concentrate
• Memory difficulty

Treatment

• Stimulants to increase alertness during day time
• Antidepressants
• Lifestyle changes like avoiding alcohol and caffeine, losing weight, etc.
• Treatment of underlying cause

Prevention