The Brief TikTok influencers are encouraging people to tape their mouths shut at night for better sleep. Doctors are warning about a new trend of taping your mouth shut at night as a hack for better sleep. Should you tape your mouth shut at night? But even if you’re a chronic mouth-breather, taping your mouth shut is not the best way to address it. The disorder is linked to both open mouth breathing and snoring, and is typically treated with a CPAP machine.