Have you tried the water yet, as suggested by SS and then CF? I recommend trying that, too. If you have any doubts about its effectiveness, then here is a more objective account on YouTube: http://www.youtube.com/watch?v=33IiYb8htHk
This is just a short introductory video, which should give you the gist. It shows how water is easily influenced by our emotions and intentions. Hope it helps. In the case of dreams, it works by absorbing the unpleasant emotions in the dream; that's why Soul Sail said to throw it away the next day. Or, if you fancy a challenge, just take the water and repurify it with your own kind, loving thoughts!
I don't quite understand why you should want to seal his room - with your son in it, or to keep him out? I urge you to try the water first.
Warmest best wishes to you!
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