Thank you for your question. It would be helpful if you could post some pictures. It is very typical for other eyes to change shape when tired, one may become heavier and droopier than the other therefore appearing smaller. If this happens only when you are tired, I would suggest it not being a problem, however if this is not the case, please make sure you find a reputable and qualified eye surgeon who can assess you properly to give you a realistic idea of what the cause is and what outcome can be achieved. Upper Eyelid Surgery, where extra skin and fat on the upper eyelid can cause the eyes to feel and look tired. Taken to the extreme, the extra skin can hang so much that it can hamper your vision and cause discomfort. Eyelid surgery combined with Eyebag Removal can effectively reduce the excess skin from the upper and lower eyelids to leave you with wider more youthful looking eyes. All The Best