Many of us can agree that the "Best part of waking up is, well you all know the slogan. But did you know that caffeine is known to be an antioxidant when taken orally?
It is also claimed to reduce dark, puffy circles under the eyes by minimizing the blood vessels that show up beneath the skin. Along with anti-inflammatory benefits. Even though its role in skin care is not conclusive, I'd be willing to slather it on my puffy under-eye bags in an attempt to look more rested and alert.
You could go the DIY route and apply a homemade concoction to your dark circles, or you could invest in a great medical grade eye cream.