The song "Snowfall" by Øneheart and Reidenshi is widely regarded as a masterpiece by many around the world, including me. If you want to relax and fall asleep quickly, try playing the onehour loop of the rain and thunder version of this song.

Music
Song: snowfall (Slowed + Reverb)
Artist: Øneheart, Reidenshi
Album: snowfall (Slowed + Reverb)
Licenses: DashGo/Audiobee (on behalf of Øneheart & reidenshi); DRM New Zealand (Music Publishing), LatinAutorPerf, LatinAutor, Songtrust, BMI Broadcast Music Inc., and 6 Music Rights Societies