I call it an insight. It happens a lot with dreamers, they are doing something or read something that was related to a previous dream, and it trigger your memory, and you recall something. Looks like yours was pretty strong. It happens often to me, but not with that power, hehe.

You can use this, or adapt, to recall dreams, as I do: When on bed, and you can't recall a single thing, just think random words on your head, like: dog, monitor, desk, anything you can think off, you might pull something related to your dream and get a recall from it.