Zapping my kid

Hi,

My 3 years old son tend to catch flu quite easily. I've been using my zapper on me with quite some success, and would like to try it on my son. The problem is, they is no way I can make him hold the handle willingly. I planning to try during his sleep...Would it work with strapping the copper hanles on his feet instead of the hands? Has anyone got a suggestion?
Thanks