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.
Benefits of Taking Vitamins at Night. Some people may feel nauseous when they take multivitamins or supplements containing iron. This is especially the case with women who get morning sickness during pregnancy. In this case, it may be better to take your vitamins at night when you may be able to sleep through any adverse effects, according to MedlinePlus.