Is there a REASON?

There is time when we have nothing to do. Just nothing to think about. Even though the truth is you have a bunch of thing awaiting to be completed. There is time we feel boring and yet we don't feel like doing things. This type of feeling sometime make us feel tired. Why are we in this stage sometime? What does it means? Is there any reason behind this as there are always reason behind everything. Or this is because of the things that we have a few days ago, an effect from the thing that we have done? This is all a question that sometime, its does not even have an answer at all.