Some WILD tutorials suggest using an alarm clock to help you wake up during the night so you can do a WBTB (which is generally the easiest kind of WILD). With the WBTB, you are supposed to get awake and clear-headed anyway, so the alarm won't hurt. However, if you want to try to WILD without a WBTB I could see how the alarm would be really jarring. In that case try a cell phone alarm set on vibrate against your body, if you have one.