Recommendations for Relaxation/Fall asleep music ?

I'll second the Chopin, and Music for Airports. Try to find MfA by a group called Bang on a Can. Unlike Eno, no synths, but live musicians. 

I'm generally not a fan of Andreas Vollenweider, but his Caverna Magica is suitable for casual or serious listening, plus it has great sonics.

Brian Eno Music For Films

Allman Brothers In Memory of Elizabeth Reed 

Stormy Monday

Kind of Blue

Marconi Union - Weightless. Experts helped with the composition. There is an 8 min and 10 hour version. It is effective and has been studied by scientists.

Thanks,

Aldnorab

+1 for Andreas Vollenweider Caverna Magica

Sigur Ros