i.e putting tape (that's meant for the face) over your lips to keep them closed at night to prevent mouth breathing and only breath through the nose?
It sounds very risky I know but apparently our natural reflexes would prevent us from suffocating and will naturally awaken us to take off the tape if our nose is obstructed etc. and generally seen as a fairly "safe" technique.
Has anyone tried it? Seen any positive effects from it? How long have you mean doing it? every night?
I tried it yesterday and seemed to go ok