I'm gonna take this to mean a song that is soothing and calm, and not a song that's so boring it makes you fall asleep. I guess for me that would be Landslide by Fleetwood Mac.

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Stevie Nicks has such a beautiful and unique voice, and the gentle instrumentals are so pretty. This is just a really beautiful song, and I actually do sometimes listen to it when I'm going to sleep, so it's kinda perfect for this day.

In addition to all that, it's an all-around good song with wistful lyrics that make me feel nostalgic for no particular reason. I love it ❤