Lulls are what happens when you run out of things on your to do list. This is an easy time to become complacent. Always make sure you are prioritising your tasks with your mission, rather than what might feel like a cool or fun thing to do, even if that thing is constructive in some way. Otherwise you risk not getting the important things done.
Keep your mission in mind, and use the lulls to get through the tasks that give you the greatest benefit for achieving your mission. Only then can you do the more tasks.