Ok, I have an Apple Snail that likes to ride the waves! Every so often, I will look in and find him just floating around on the top having a grand old time. (Of course, I think he's dead, and can't do anything to get him to grab on to anything) After a day or so when I am convinced that he must me dead

, I'll look in and he'll be crawling around the tank as if nothing had happened.
Does anyone else have this problem? Is it normal? Is there something wrong?
Please let me know what you think about this behavior.
Thanks!