Welcome! 
The first part is exactly the example given in the official knowledgebase article on smart home monitor, so you can go ahead and set that up.
As far as doing it at night, how are you defining ânightâ?
Do you mean âafter sunset and before sunriseâ?
Do you mean a specific time frame, like â10 PM until 8 AMâ?
Do you mean when your house is in ânightâ mode?
Or something else?
Also, before we go any further, read the following to explain the difference between âModeâ and âsmart home monitor armed stateâ because it can help clear up a lot of confusion.