I have to emphasise, that
sensations are not the goal. When you WILD, your goal is to let your body fall asleep while your mind stays awake, but only to the point, when a dream has formed. Then you need to fall asleep while keeping your lucidity.
It's possible not to feel any sensations and have a successfull WILD. You should not wait for them or pay too much attention to them. Each time you wait for sensations and they don't come, you lose your chance for a lucid dream, because you are focusing on the wrong thing. Wheather you get sensations or not, continue with your attempt.
You should basically just try and go to sleep after some hours of sleep, and let your body fall asleep while you keep your mind awake by mantras. Everybody interested in WILD, please read this
WILD (sageous) tutorial.