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.
Like whole wheat bread, whole wheat cereals help convert tryptophan into melatonin and serotonin. Research has shown that boosting serotonin levels can help promote sleep. Somer recommends any cereal with 100 percent whole grain, but says to avoid adding milk, because the protein in the dairy will block tryptophan from entering the brain.