I’ve been an on again off again subscriber to cpap therapy since 2015. Recently I discovered nasal pillows and have adhered to pulmonary medicine advice to use the cpap for the last two months without finding much of a grove. I find it hard to discern efficacy. My friend says I watch the numbers too closely. But I remain tired throughout my days and in light of this disheartening result I keep looking at the numbers to confirm that the effort is worth the struggle.