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sleep × 154human-biology × 54
neuroscience × 29
brain × 24
circadian-rhythms × 16
endocrinology × 11
physiology × 10
dreaming × 8
melatonin × 8
biochemistry × 7
evolution × 6
zoology × 5
eyes × 5
hearing × 5
neurophysiology × 4
cardiology × 4
light × 4
pharmacology × 3
human-physiology × 3
vision × 3
digestive-system × 3
neurology × 3
health × 3
cell-biology × 2
entomology × 2