Refusal of sunlight can make a person feel tired, appetite, depressed, unable to get up in the morning, and even highly desirous of avoiding all social contact.

Sunlight is a natural stimulant. The best way to refresh yourself is to take a half-hour walk, jog, or bike ride in the morning sunlight, and don't wear sunglasses that are too dark, so as not to block your body's absorption of sunlight.

Adequate exposure to sunlight is good for your health because your body can store large amounts of vitamin D for emergencies, which helps maintain strong bones and teeth. Scientists explain that sunlight boosts the activity of a chemical in the skin that converts it into vitamin D, and our bodies need a ration of vitamin D to absorb calcium.

But it's not a good idea to overexpose yourself to the sun when you're outdoors, and you can use sunscreen cream.