1)
What are "Po'alei Aven Al Mishkevosam"?
1.
Rashi: The entire night they resolve in their hearts how to do the evil in the morning. Radak ? people think more while lying on their beds, for they are not engaged in anything sensory.
2.
Malbim: While lying on their beds they are isolated, and cannot steal. They think how to oppress and steal, and also do evil. Refer to 2:1:2:2.
2)
What do we learn from "b'Or ha'Boker Ya'asuha"?
1.
Radak: Early in the morning they do the evil that they thought about, for they have the ability to oppress Aniyim.
2.
Malbim: Since they do the evil immediately when morning comes, it is as if they did it at night, since nothing stops them from carrying out their intent.