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Talk about a low cost investment that can greatly improve sleep quality. After the first 1-2 nights to adjust to it, I noticed that I now wake less often and also feel less tired in the morning. These also seem to train you as I skipped a night but managed to sleep most of it with my mouth closed. I am a bit worried whether the adhesive might have any longer term, negative effect on skin elasticity or pull down lips a bit overtime, but will keep an eye out for that. I intend to reorder.