Dream in Dream

Last night, for the very first time ever, I had a dream within my dream. I distinctly remember 'waking up' from a nightmare, but realizing that I was still dreaming. I've quite often known I was dreaming while dreaming, but never before have I had a dream within a dream. The 'nightmare' consisted of getting a phone call in the middle of the night that someone had died. After being woken up by the phone call, I woke lots of other people up to tell them the bad news. But they soon checked into it and discovered that I had only dreamed the phone call. But as they were figuring that out, I realized that I was only dreaming the dream about having the nightmare.