Do you find that most “environmental sounds” offered in clocks and on CDs to help you sleep are 1) really from white noise generators (and damned irritating to me, awake or tying to sleep) or 2) on too short a loop, and you can tell when the cycle starts up again? I found someone who agreed with me on these two items.
Richard Searles http://earthdancemusic.com/natureseries.html offers an album of Pacific Surf. It's 60 minutes of nothing but surf music, captured in one recording at the beach. You might enjoy some of his music, as well.
I had a chance to talk to him at a fair he was at–I have a couple of his albums from when they were originally issued, some time ago, and I was happy to chat. It often gets boring and tiring running a booth at a fair (except for the times when crowds descend upon you!), indoor/outdoor makes no difference. It's probably pleasant to chat with someone who knows and enjoys your work.
We got on the subject of “nature” sound albums and insomnia, and he showed me the three albums he had recorded. Two of them are foresty–one's in a redwood grove, and the other by a lake with loons, and they do have birds in them, which I can find disrupting to sleep-time relaxation. Fog horns and bouys are right out!
I also talked about my occasional practice of trying to run a piece of instrumental music through my head in order to switch off my active brain–won't work for a musician!
I have yet to listen to the albums I picked up that weekend, so I can't say anything about the entire album. I did listen to a bit of each of his Nature Series albums before I bought two–he doesn't think that music necessarily belongs with nature recordings.