So far I've been hanging my mask on the corner of the bed post during the day, to let it air and dry any humidity. I've been doing this without any problems for over 3 months. Last night, after I'd been asleep for two hours a Moth, which had crawled inside at some point, decided to wake up and flutter around inside the mask. I couldn't get it off quickly enough!!! Now I've procured a thin cloth bag and hang the mask in that. Anyone else with an odd experience?