Better day, but nightmares

So my day is a little bit better today. The dp/dr is definately less, but in it's place is depression. I'm wondering if maybe my brain has started to depersonalize to cover up the depression, thinking I can't handle it. I would almsot prefer a depression, because it is easier to work out, especialy when I can think of several things in my life that are leading to it. However, I decided last night to go to bed earlier than usual, around one, and I had a horrible night. Really bad dreams of snakes and drowning, waking up gasping for air (although that is most likely becuase I hadn't put on my cpap machine for my sleep apnea, it got better when i did), uncomfortable dp/dr feelings whenever I woke up, sadness, all that fun stuff. Im wondering if so dramatically adjusting my sleep schedule might have led to this. Other than that i'm feeling better today, although I'm still obsessing about my breathing, and it's the hardest thing for me to focus outward on. If I get invovled in something, it is better, but i'm still 'aware' of it. I guess, however, that everyone is 'aware' of their breathing, they just don't obsessively focus on it.