Really? A lullaby?

I just listened to Brahms' Lullaby for the first time in I have no idea how long and what struck me most about it is how much it put me on edge. Even though I immediately remembered how calming it is and recognized the characteristics of the song that make it so, it reminded me of something that I can't quite put my finger on and whatever that is just isn't settling with me properly. It's as though I have it associated with some bad memory that I've repressed, not that I really think that's the case. Just, for some reason, this beautifully soothing song is making me uneasy. Essentially, it feels the same as when, lying awake at night, I remember everything that I need to do or try to remember what it is I forgot to do.

This really is strange.