| F51 | Sleep disorders not due to a substance or known physiological condition |
| | Insomnia not due to a substance or known physiological condition |
| | Primary insomnia |
| | Adjustment insomnia |
| | Paradoxical insomnia |
| | Psychophysiologic insomnia |
| | Insomnia due to other mental disorder |
| | Other insomnia not due to a substance or known physiological condition |
| | Hypersomnia not due to a substance or known physiological condition |
| | Primary hypersomnia |
| | Insufficient sleep syndrome |
| | Hypersomnia due to other mental disorder |
| | Other hypersomnia not due to a substance or known physiological condition |
| | Sleepwalking [somnambulism] |
| | Sleep terrors [night terrors] |
| | Nightmare disorder |
| | Other sleep disorders not due to a substance or known physiological condition |
| | Sleep disorder not due to a substance or known physiological condition, unspecified |
