There are many people who love working a night shift. It works well for them for any number of reasons. However, if you are someone who has to work a night shift and you don't like it, it can be very difficult to adjust. Research shows that working rotating and night shifts is not healthy. There are health conditions that develop as a result of the lack of natural daily sleep patterns with the cycles of dark and light.
Shift workers have to work extra hard to maintain their health.
Yes Anger in this kind of situation is a clue to stress level and anxiety. This is an indication that some counseling would be very useful. It is also an indication of lack of sleep and the level of distress as a result. The stress that comes as a result of feeling out of control can add to a sleeping problem. Your relationships with people at home or work can cause insomnia if you are concerned about them.