| Diagnostic criteria A-F must be met: | |
| A | The patient has daily periods of irrepressible need to sleep or daytime lapses into sleep or, in the case of prepubertal children, there is a complaint of behavioral abnormalities attributable to sleepiness. |
| B | The patient's sleep time, established by personal or collateral history, sleep logs, or actigraphy, is usually shorter than expected for age. |
| C | The curtailed sleep pattern is present most days for at least three months. |
| D | The patient curtails sleep time by such measures as an alarm clock or being awakened by another person and generally sleeps longer when such measures are not used, such as on weekends or vacations. |
| E | Extension of total sleep time results in resolution of the symptoms of sleepiness. |
| F | The symptoms are not better explained by another untreated sleep disorder, the effects of medications or drugs, or other medical, neurologic, or mental disorders. |
