A close friend of mine passed away almost exactly a year ago and since then, I didn't have a lucid dream.

Before that, whenever I had a nightmare, I was able to realize that it was a dream and stop bad things from happening, or take them without fearing the consequences, or simply imagine myself to a different place. Or wake myself up.

But since my friend died, I seem to have lost my "ability".

Has this ever happened to any of you? Will I ever be able to lucid dream again?