Most of the tracks from Yume Miru Kusuri. I never finished any of the routes because the situations are too exaggerated for my liking, and the VN makes me extremely sleepy with its soundtrack and dreamy artwork.
The game turns 20 years old this year, so maybe it can already be considered retro.
'Dolphin' from The Longest Journey is a chill trip-hop song that you could listen to in the afternoon or evening.
A few years ago I found comfort in the Ecco soundtracks. They helped me get through a bad time, and sometimes I'd fall asleep to the music.