| for sleep | 15 | purpose |
| in maintaining the endothelium | 8 | other |
| in regulating sleep | 7 | other |
| melatonin → be → important | 33 |
| melatonin → be → essential | 21 |
| melatonin → be → vital | 19 |
| melatonin → be → critical | 9 |
| melatonin → be → crucial | 7 |
| melatonin → be important for → everyone | 3 |
| negative | neutral | positive |
| 0.043 | 0.515 | 0.441 |
| Raw frequency | 92 |
| Normalized frequency | 0.596 |
| Modifier score | 0.500 |
| Perplexity | 34.732 |