| Typicality: | 0.447 |
| Saliency: | 0.591 |
| often | 3 | temporal |
| in the most severe cases | 3 | temporal |
| upon awakening | 2 | temporal |
| sleep apnea → cause → headache | 12 |
| sleep apnea → cause → morning headaches | 9 |
| sleep apnea → be associated with → headache | 6 |
| sleep apnea → be linked to → headache | 6 |
| sleep apnea → lead to → headache | 4 |
| sleep apnea → result in → morning headaches | 3 |
| negative | neutral | positive |
| 0.921 | 0.075 | 0.004 |
| Raw frequency | 40 |
| Normalized frequency | 0.591 |
| Modifier score | 0.600 |
| Perplexity | 53.874 |