| promote sleep | 0.54 |
| regulate sleep | 0.52 |
| wake cycle | 0.52 |
| regulate circadian rhyt… | 0.50 |
| regulate sleep/wake cyc… | 0.48 |
| induce sleepiness | 0.46 |
| regulate sleep cycles | 0.43 |
| help with jet lag | 0.43 |
| fall asleep | 0.43 |
| help people | 0.42 |
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| drowsiness | 0.35 |
| change | 0.35 |
| headache | 0.31 |
| depression | 0.30 |
| dizziness | 0.29 |
| relaxation | 0.27 |
| nausea | 0.26 |
| vivid dreams | 0.25 |
| irritability | 0.24 |
| fatigue | 0.23 |
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| effect | 0.47 |
| protective effects | 0.34 |
| property | 0.33 |
| opposite effect | 0.31 |
| an anticancer effect | 0.30 |
| side effects | 0.28 |
| calming effect | 0.25 |
| a particle size distrib… | 0.25 |
| fewer hours of daylight | 0.25 |
| few side effects | 0.24 |
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| hormone | 0.81 |
| natural hormone | 0.54 |
| the sleep hormone | 0.51 |
| occurring hormone | 0.49 |
| important hormone | 0.46 |
| powerful hormone | 0.37 |
| neurotransmitter | 0.37 |
| pineal hormone | 0.35 |
| vital neuroendocrine ho… | 0.34 |
| drug | 0.32 |
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| serotonin | 0.37 |
| the amino acid tryptoph… | 0.37 |
| produced by pineal gland | 0.74 |
| secreted by pineal gland | 0.68 |
| released | 0.67 |
| produced by the body | 0.66 |
| produced | 0.64 |
| produced in the brain | 0.62 |
| secreted | 0.60 |
| synthesized | 0.54 |
| taken at night | 0.54 |
| produced at night | 0.54 |
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