@Jad
You have trouble getting motivated to pixel on your free time? The day before it sounded like a spectacular idea to make something tomorrow, but when the time comes there is no will to continue? Your brain does everything in it's power to prevent you from drawing?
Maybe you should make a thread about it or talk with some of your artist friends for some workarounds?
From my lurking place it seems you have some issues working outside your dayjob. Maybe there are some patterns that lead you to a negative feedback loop and misery? Outside it might seem like lazyness, but sometimes people are physically handicapped by their brain not cooperating.
I might be completely off with my assumptions, but this kind of things are common.