As to droopy eyes, it can happen to one upper eyelid or both. If you just mean puffiness with droopy eyes, there are some ways out of this situation. Apply some ice compress on eyelids could help relieve the puffiness, which could tighten the puffy and flabby eyelids. Do a little massage with some vitamin E oil, which could help the blood circulation around eyes, make the puffiness go away soon. However there is a kind of disease named as droopy eye or ptosis in medical terms. People might be born with ptosis, which is congenital or hereditary. There is another possibly that ptosis might be caused by aging related problem. Because as we are aging, we are losing collage and the elasticity of skin so that the upper eyelids might get lower and lower. The worst situation of ptosis is the upper eyelids cover the eyeballs, which might lead to amblyopia. There is no other effective treatment to ptosis other than surgery. This kind of surgery is blepharoplasty. Only this surgery could solve the ptosis problem. I am not sure what situation you are in, yet you could check and see if any symptom fit your case and try to solve it with proper treatment. Good luck!