In case you might be interested, the last two sections of Tom Bisio's Daoist Meditation course ($150) are on Sleeping Meditation and Sleeping Gong.
He also has a book ($20): Daoist Sleeping Meditation: Chen Tuan's Sleeping Gong.
I think that master who pulls trucks with his balls (Master Tu maybe?) has an 8 Pieces of Brocade DVD that also has some information about sleeping qigong on it. I haven't seen it.