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sleep × 125medical-science × 25
physiology × 11
dreaming × 9
neurology × 7
nutrition × 6
biology × 6
environmental-health × 6
technology × 6
psychology × 5
zoology × 4
children × 4
memory-foam × 4
mortality × 3
learning × 3
lucid-dreaming × 3
history × 2
consumer-products × 2
natural-remedies × 2
safety × 2
computers × 2
intelligence × 2
mobile-phones × 2
psychiatry × 2
parenting × 2