Hair and Sun Exposure
A: Well, without being able to physically perform a before and after examination, my estimation of the cause for your hair's reactions is purely a matter of conjecture, based on what I know of the way hair usually responds to sun exposure.
Depending on the initial condition of your hair, the warmth, heat and natural oils can actually be beneficial to your hair, but too much of this good thing would still begin to have detrimental effects.
Without the sun, similar effects can be achieved through a variety of methods. You might try using a thickening shampoo and conditioner formula, and after the hair is dry and styled, use a spray laminator to very lightly mist the hair.
The better spray laminators consist of light fruit oils and are great for locking moisture into the hair and giving it a sheen. Remember, though, that these laminators are a "less is more" prospect. Too much moisture will leave your hair looking oily and defeat the purpose. Some women find that products like Apple Pectin shampoo will give the hair the kind of look they are looking for in this nature.
You can also choose a more natural method to add body and shine, by using lemons on the hair. The juice of the lemon is mixed with water and poured through the hair as a rinse, while the peel is saved and squeezed over the dried hair to release the lemon oils from the skin.
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See also:
Sun block for hair
Why does the sun lighten our hair, but darken our skin?
Does the sun make your hair grow faster?
Summertime must have for your hair and skin