The goal of this clinical trial is to test for the efficacy of the newly invented device #DidgeriTU with non-severe obstructive sleep apnea. The main question it aims to answer is: • Can DidgeriTU reduce apnea events in patients with non-severe obstructive sleep apnea? Researchers will compare DidgeriTU with a sham device to see how the apnea event has changed. Participants will: * Use DidgeriTU or sham device for 3 month * Do an online questionnaire once a month during the study * Home sleep test, lung function test, and tongue strength test at the start and end of the study