If you've had a long, tearful night, or maybe you were up all night studying, or maybe a combination of the two (yes, studying can indeed bring me to tears... ESPECIALLY if it's for economics. Don't get me started, I hate econ omg) and you've woken up in the morning with puffy, tired eyes, here's an amazing trick that actually works.
Put two metal spoons in a glass of cold water and put it in the freezer for a while. Once the spoons are super cold, hold each one to your eyes for however long it takes for the puffiness to go down. It shouldn't take anymore than half an hour, and you'll feel ridiculously awake after!