Yes, it is quite normal for many people to get small eyes when they wake up in the morning, so do not worry. The most probable cause of this issue might because you do not have a good sleep last night. For example, maybe you have a dream almost whole night, which means your brain still works and have not get rest while you are sleeping. Or you have suffered from sleep disorder, it is annoying and also affect your metabolism and make your eyes feel tired, which will finally give rist to small eyes. In view of this situation, a good rest is the most essential and available. Meanwhile, you can also put some ices or tea bags on your eyes, it is also a useful way to relieve the symptom. Whereas, if the sympton still exist, you had better ask a professional doctor for help as soon as possible.