SimilarityRank
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