Once again any Brooks and Dunn song will make me fall asleep if need be, but the song I use most to fall asleep is "Quicksand" by Bethany Joy Galeotti. I have that song on every musical device I own, but I most commonly listen to it on my phone so I can have it right near my face on listen to it on repeat. Her voice is amazing and the song itself is beautiful and soothing.
...it's just getting hard to believe it."
Bethany Joy Galeotti