Difficulty remembering

I've been working on a post about the best little moments of 2012 for a while now… actually, I noted a few things at the end of last year and haven't added to the list since. I'm not sure why it's so difficult; I enjoyed the year, and my memories from it tend to make me smile. I think I'm finding it hard to single out specific moments, points in time when I remember truly feeling joyful. My recall of what happened seems pretty clear, but I can't remember whether I actually did feel joyful. Many things make me feel happy, but true joy is rare, and often difficult to distinguish from it.