Version July 2025
| Criteria A through E must be met: | |
| A | There is a significant delay in the phase of the major sleep episode in relation to the desired or required sleep onset time and wake-up time, as evidenced by:
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| B | The symptoms are present for at least three months. |
| C | When patients are allowed to choose their ad libitum schedule, they will exhibit improved sleep quality and duration for age and maintain a delayed phase of the 24-hour sleep-wake pattern. |
| D | Sleep logs are required, accompanied by actigraphy monitoring, whenever possible, for at least seven days, preferably 14 days. These demonstrate a delay in the timing of the habitual sleep period. Both work/school days and free days should be included within this monitoring. |
| E | The sleep disturbance is not better explained by another current sleep disorder, medical disorder, mental disorder, or medication/substance use. |
