Several vitamins enhance sleep and reduce anxiety. Deficits in vitamin D, which regulates mood and sleep, may cause anxiety and sleep difficulties. B vitamins, especially B6 and B12, modulate mood and sleep neurotransmitters. They relieve anxiety and improve sleep. Though not a nutrient, magnesium assists in relaxation and calms the nervous system. Vitamin C reduces stress, while melatonin supplements regulate sleep cycles. Buy Modalert 200, which includes modafinil, may help people with narcolepsy stay awake throughout the day. However, a balanced diet with these vitamins and minerals may naturally promote sleep and decrease anxiety. Always seek individualized medical advice.