How do I wake up in the middle of the night on my own?

[larvitar563]

So I've been trying to get my first lucid dream for a few months now (or crap, just trying to be able to remember my dreams more), and I don't have an alarm clock, well, of my own anyway. And even if I did, by the time I would have it go off, it will wake up my brother. Me and my brother share a bunk bed, and having an alarm clock go off in the middle of the night will probably annoy him. So what other ways that I could use to wake up in the middle of the night