I have been trying the Zeo for about 1 month and I noticed that most of the nights I would have a ZQ of between 90 and 105, but I will still feel very tired in the morning and it will get worse during the day. On average, I get about 8 hours of sleep, including an average of 2.5hours of REM and 1.5hours of deep sleep. I go to bed around 11pm and wake up around 8am. I noticed that sometimes I would feel great for 1 week, then another week I would feel very tired, then I would feel good again for another week, and so on. I got a sleep study done and they couldn't find anything abnormal and I'm not taking any medications. Zeo Team: Any ideas on what is going on? Anybody else have experienced something similar to this? Thanks in advance!