In this research study, subjects who have recently been diagnosed with OSA will undergo two research study PSGs. Before the first study PSG, subjects will be randomized to receive either Oxytocin (40 IU) or placebo, in a blinded manner, 1 hour prior to beginning the test. The PSG will then continue as usual, and subject data pertaining to the PSG will be gathered. Subjects will then return within 4 weeks for a second research PSG, where one hour before the test they will receive the opposite intervention that they did not received during the first research PSG study. Data measurements will be re-measured and compared between the two PSGs.