Sorry about that.. almost 11am here (Japan)... been troubled all night/morning.. no sleep :p
(sound like ‘fiver’ .. “Watership Down”) now :p .. will try to sleep soon..
A bunch of nature type recordings on YouTube, most of 'em an hour or more in length.
Waterfalls, birds, that kinda stuff.
This link will take there, then look along the right hand side.
Pair of headphones and I bet you'll be asleep before ya know it .. good luck, and sweet dreams ;-)