i've had real bad depression for a long time now and i recently noticed that i'm feeling good in my dreams, no matter what happens in them. it's like a general state of happiness i get in my dreams, compared to a general state of unhappiness i'm in irl. even when i have nightmares, i feel good. it's becoming really difficult to get up and try to make the best of the day while i just wanna go back to my dreams. 
does anyone know anything about this and why it happens?