Parasomnias
Abnormal event occurring during sleep
Primary insomnia
Difficulty maintaining sleep
Primary hypersomnia
Excessive daytime sleeping
Narcolepsy
Irresistible attacks of refreshing sleep
Circadian rhythm sleep disorder
Mismatch between normal sleep cycle for a persons environment and his or hers sleep wake pattern
Nightmare disorders
Repeated awaking from sleep
Frightening dreams
Sleep terror disorder
Abrupt awakening
Panicky scream
Dyssomnias
Disorders of the amount , quality or timing sleep