First, your negative dreams are first related to your own negative emotions;
Second, your dream, including waking up afterwards, belongs to the classic dream of "sad dreams and crying". In Huangdi Neijing Lingshu Yin Xie Dream, it is explained that "when the lungs are full of qi, they dream and cry". Moreover, you are still in a sad mood after waking up, which fully shows that you have been in a mental state for some time, even affecting lung qi, and may have respiratory diseases and discomfort;
Three, two children died in the dream, both of them were children. This situation may be related to the recent news event that five children were buried underwater in Zhejiang. You may be a parent, you must have heard the news, which has had an impact on your mental mood. From this, it can be inferred that you may be a delicate and sensitive person with a physical condition of insufficient qi and blood.
As a matter of fact, your niece will come to live in your house today. This situation has caused you pressure invisibly, and there will inevitably be some burdens in your heart, coupled with physical fatigue and emotional tension, so such negative results may occur in your dreams;
When you sleep at five or two o'clock, you should be in "Yin Shi" when your dream happens, while in Yin Shi, the qi of meridians is in the lungs, and the lungs are "sad" emotionally, so your dream is also related to sleeping too late.
Suggestion:
1. There are many reasons for your dream. The comprehensive explanation is caused by mental stress, emotional disorder, physical weakness and excessive lung qi. Therefore, your countermeasure is to relax emotionally and psychologically as much as possible, and at the same time pay attention to the overall physical condition of deficiency and lung qi excess.
2. The negative performance of the body will lead to negative scenes in dreams, so don't worry. According to my experience, this is not a predictive dream, but more of a pathological dream, which means that the scene in the dream will not become a reality.
Finally, if possible, please change to a job where you can sleep normally.
Wish you all the best!