Five month old kitten very suddenly started squinting. One of his inner eyelids seems to be over part of his eye (the side toward his nose). When he opened it all the way, it looked kind of cloudy. It seems to be getting worse in the last hour. He was turning his head like he couldn't see out of his one eye. He seems to be starting to squint in his other eye too. He's sleeping now. Could he be having a stroke? Should I wait until morning to take him to the vet, or does this sound like an emergency? He was fine immediately before he started squinting. He ate and pooped after I noticed it. He got grumpy because we were handling him so much trying to look at his eye, but we didn't touch it. Can anybody help? Thank you.