Sound of rain or being on a train does help me sleep, in reality I spend at least fifteen minutes every night quietly watching the night-sky, removing thoughts that would normally keep me awake.
Finding the right frame of mind helps most nights, not always still have nights of turning the bed upside down and getting no sleep whatsoever.
Formal meditation is not something I ever tried so interesting to learn this worked for you, any unusual sound keeps me awake.
!WINE
RE: Meditation for Overthinking