| naturally | 23 | manner |
| at night | 21 | temporal |
| by the pineal gland | 16 | other |
| melatonin → be → produced | 125 |
| melatonin → be produced in → human | 18 |
| melatonin → be produced in → response | 16 |
| melatonin → be → made | 12 |
| melatonin → be → formed | 5 |
| melatonin → be synthesized in → skin | 4 |
| melatonin → be produced by → gland | 4 |
| melatonin → be → created | 4 |
| melatonin → be → manufactured | 3 |
| melatonin → be produced by → human | 3 |
| melatonin → be produced by → cell | 3 |
| negative | neutral | positive |
| 0.155 | 0.712 | 0.133 |
| Raw frequency | 197 |
| Normalized frequency | 0.728 |
| Modifier score | 0.731 |
| Perplexity | 30.070 |