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sleep-aids × 14sleep × 6
sleep-cycles × 4
sleep-deprivation × 4
treatment-options × 3
insomnia × 3
drug-tolerance × 2
melatonin × 2
medications × 1
supplement × 1
research × 1
effectiveness × 1
time-of-day × 1
body-temperature × 1
home-remedies × 1
feet × 1
magnesium × 1
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herbs × 1
antihistamines × 1
zinc × 1
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oxygen × 1
sedative-sedation × 1
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