Vinegaroons excavating

My Vinegaroons starting to dig burrows in the middle of the night. All four Vinegaroons have made themselves burrows with tunnels and multiple chambers. I’m lucky that two of them built there starter burrow right next to the side of the container. All four have a main burrow they use but still continue to excavate in other parts of  the container. There is always a new pile of dirt and a new tunnel started by the time I check on them the next day.