for sleep or relaxation, Lullatone is one of my favourites they're a duo that make what they call 'pajama pop' — their albums Computer Recital & Little Songs about Raindrops are personal favorites for such purposes, as well as their album While Winter Whispers.
Lo-fi music in general does the trick for me and depending on which artists, you can explore different kind of vibes and moods. "In love with a ghost" became quite popular thanks to youtube recommendations so you could start from there
