Just think about other things. I have developed a method that I call the mind-tether method. Imagine your mind as some object, like a sports ball or a dog or whatever. When you are conscious you are holding it with your hands and directing it towards things. When you are dreaming, it is off wandering on its own doing whatever it wants. With my method, I keep it on a tether. So I have this thing kind of like a dream where I'm not really conscious and I forget my real senses, but my consciousness is still there and I can stop this dream whenever I want.
I'm not sure how to induce it as I invented it purely out of imagination and I don't know how it works, but I'll try to explain. I just sit back, picture a scenario, an action I'm doing, and then let my mind slip into it. And I just kind of watch it play out. I'm not sure how I keep myself from completely going to sleep but I do.

Or you could just either:
1. Try to forget about it; think about other things. Visualize a scenario and visualize all your senses. Then do something, like walk around.
2. Wait as long as you can bear it between each gulp.