I find that white noise helps as long as I'm not in hyper-vigilance mode, because if I am, the white noise is something thats keeping me from hearing an enemy, which drives me insane (like when someone is snoring too loud, or the AC is squeaky )... so it works great lots of the time. (Classical music, newagey music, movie soundtracks, ancient music (greek/roman) and thunderstorms and a little bit of delta wave stuff are my go-tos.)