I go through phases of this, and I also go back and forth between being excited about stuff at work versus being excited about side projects.
Sometimes things just aren't going well at work and that really drains your energy. When that happens to me, I try to tell myself that I need to relax and not feel guilty about it. After all, doing stuff on the side is meant to be something that you enjoy doing. By stepping away for a bit and getting what I need to get resolved either at work or with other things in life, everything is able to fall back into place and you remember why you enjoy working on side projects or just playing around with new frameworks/tools.
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