I am using the nasal pillows. I just started using the CPAP in mid February. The first week it seemed to work well. I was waking up feeling refreshed. After about a month of use, i started having problems with nasal congestion and post nasal drip. The tube is cumbersome and lately i have been feeling tired and raking a nap in the afternoon. I also take weekly allergy injections which were very effective until about a month after i started CPAP. My AHI varies between 2 and 8. I am wondering how long it will take to be consistently below 4 or 5.