here is the thing, I am a 1st time listener, and I am going for an all nighter 2 days in a row :( 
I enjoy the nap I take mid work honestly, the beats can't be topped, they are mind refreshing, I am glad I found you. 
The only problem is that I sleep deeply, the bell ring isn't enough for me to wake up, I have to manually set a loud annoying alarm with 8-bit sounds just to wake up XD
Your sleep cycles change over the course of a night, so looping the same track isn't recommended. If you want to listen for more than one cycle, I recommend starting here: https://youtu.be/VZMwNi8IPXs
REANS