This is from Vera:
We are aware of this issue with the GoControl LBS0Z-1 lights turning on randomly at night around 2:00am. What happens is that these devices do not respond to 'update neighbor nodes' , which is where you tell a zwave node to see what other nodes are in vicinity in order to keep the mesh network strong and make sure that we can keep communicating with the light bulb.
In fact, zwave specs require controllers to do this periodically since, without this, the mesh will breakdown and devices will lose communication.
What you could try is to contact the manufacturer and ask them if they have a newer version of these bulbs and if they do to ask for a replacement.