A mail-formed bandaid
This doesn’t even stick well, and because it’s (presumably) designed by altering a bandaid rather than from human anatomy, it is too long on the upper lip.  My daughter provided me something that seems to have a much better design, and I’m sure there are others.  Hers was sleepystrip.com.<br /><br />You’re on the right track regarding concept, however.  Everyone I read says that mouth breathing at night is detrimental.
Rating: 2 stars