II: Equivalence phase: At least 180 participants will be enrolled. All participants will receive the SleepStrip OTC(TM) for a night test at home, before or after undergoing an independent PSG test at the Sleep lab. Out of 180 participants, at least 26 participants will receive two SleepStrip OTC(TM) devices for two consecutive night tests at home. The remaining participants will receive one SleepStrip OTC(TM) for one night test.