I work at night and when I get home I like to sleep. The problem is that people forget that you are sleeping at the other side of the clock. Imagine you went to sleep at 9:30 am instead of 9:30 pm, what would 2 pm be to you? Would it not be the same as 2 in the morning? This is the problem, they don't realise that you need to be asleep at that time.
This is the problem with working night shift. You are disturbed thought the day. If I go and wake someone up at 2 in the morning I would be considered a rude person. Be this is what happens when you work at night.
The phone will rings, doors will slam and messages will be sent and then the person trying to sleep is angry because he wakes up feeling tired.