| Similarity | Rank | |
|---|---|---|
| brain_activity | 0.655 | 62315 |
| sleep_apnea | 0.631 | 60040 |
| sleep | 0.626 | 1586 |
| sleep_disorder | 0.600 | 60528 |
| the_brain | 0.600 | 2459 |
| snore | 0.599 | 38551 |
| breathing | 0.598 | 12667 |
| brain_function | 0.584 | 40259 |
| sleep_problem | 0.583 | 90026 |
| melatonin | 0.581 | 64514 |
| unconsciousness | 0.574 | 85895 |
| insomnia | 0.570 | 22481 |
| serotonin | 0.567 | 59388 |
| eye_movement | 0.566 | 59987 |
| arousal | 0.565 | 52294 |
| the_central_nervous_system | 0.565 | 30904 |
| body_temperature | 0.564 | 51876 |
| heart_rate | 0.560 | 24200 |
| sleep_disturbance | 0.560 | 99631 |
| the_hippocampus | 0.560 | 66791 |
| blood_flow | 0.560 | 31568 |
| sleeping | 0.559 | 15811 |
| cortex | 0.559 | 30823 |
| during_surgery | 0.558 | 78197 |
| cortisol | 0.555 | 61115 |