I would define "late night feels" as realization hitting that you don't feel or think about until you've had a long day and as soon as night hits you look back at your day and almost pick it apart until your mind changes into whole other things an example could be from my own experience is that I sometimes have a good day and sometimes I don't and when I don't I do start thinking about "well I haven't been doing good" and that I should be doing better. My goods days would consist of what I could better. I also think about the future and how different my life will continue to change every time I have late night thoughts.