a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; used as a dusting powder. The inhalation of talc is associated with a wide variety of respiratory disorders.
Factors contributing to poor sleep include vitamin and mineral deficiencies. Magnesium deficiency can cause insomnia; lack of potassium can lead to difficulty staying asleep; and vitamin D deficiency has been linked to excessive daytime sleepiness.
A: Melatonin is a hormone that helps to regulate the sleep-wake cycle. Levels of the hormone drop during the day and rise at night. Studies suggest that melatonin helps restore sleep when the body's internal clock is disrupted like when people work at night and sleep during the day or as a result of jet lag.