Life always keeps us up and down I know how a call centre job would be because I worked inside on these industry. After working in these industries, the man does not know the day and night. The most useless thing I find in the industries is that you get more night shifts in call centres. This would completely spoil your routine its impact falls directly over your body.
Only a TSR can understand what you are trying to say, I felt the same in that time. Thanks for sharing your feelings about the night shifts :)