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What would be the gravitational force that a planet with the same density as Earth and having twice Earth's radius exerts on a 59.1-kg astronaut?
Delta Waves
Slow brain waves that are characteristic of deep sleep and are associated with healing, regeneration, and non-REM sleep.
Electroencephalograph (EEG)
A device used to record electrical activity of the brain, used in the diagnosis of various neurological disorders, in sleep research, and for monitoring brain activity in other research contexts.
Melatonin
A hormone secreted by the pineal gland that plays a major role in regulating sleep-wake cycles and circadian rhythms.
Insomnia
The inability to get to sleep, stay asleep, or get a good quality of sleep.
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