Sometimes, when I'm tired and I close my eyes, I don't exactly go to sleep, but I seem to have some sort of dream. For example, once I closed my eyes on the bus, and after about ten minutes, I was kind of in one of those "dreams." Curious, I tried to feel something, but I couldn't feel a thing. However, I could hear sound, but it felt distant, like a song that's stuck in your head. It felt more like a daydream then a dream, but it was too vivid and real for a daydream. Often I forget where I am in real life in these things. Has anyone ever had a similar experience, and could I use this to my advantage in lucid dreaming?