Yeah, that sounds a bit fishy to me--why would he advertise a website that isn't up yet? And why is he asking you to compare his book to the Bible? Nearly all Scriptures dealing with sleep say that the righteous will enjoy sweet sleep, and that God speaks to His people--and some who are not His people--through dreams and visions. There really isn't a whole lot on sleep in the Bible that you could put together a lot of content on it. If so, it would be the job of one person.
You have to be careful of things like that. There are ads in the Pennysaver, etc. saying you can make lots of money stuffing envelopes, or working for the post office, or doing other stuff like home assembly, but they're all scams. Anyone who's owned their own business can tell you, you have to put in a lot of hours and hard work before you make what those scam ads promise.
I'd run his name through a Google search, but there's a chance it's too common. I say, back off on this one. Remember, in the Garden of Eden God was the source of everything, knowledge included, for Adam and Eve, but Satan came and told them, "You eat this forbidden fruit and you'll be like God, knowing everything." That could be considered the beginning of the self-help movement. God is your source; all the money in the world is His, anyway. He has the cattle on a thousand hills, and is the source of wealth. All you need is provided by Jehovah-Jireh, God your Provider. I know--He's provided for me again and again.