Sabotage

Why, when time is the most crunched and I have such a short time to complete an important project, do I sabotage myself?  Since it is so easily predicted how and when I will do it, why can't I exercise more control?  Okay, okay, I am not going to spend a lot of time beating myself up for what is already done - one book (really two novels in one volume) in one sitting - but I do want to get it documented here and attempt  to understand.  I've said before that reading is, for me, an addiction.  Addict:  to give oneself up to some strong habit.
I have chalices to make for first communion, due by Maunday Thursday.  Is there time to get them done?  Yes, just barely.  My intent was to get them finished by Sunday but I've left myself very little chance of making that happen. 
I want to make better choices about reading.  To enjoy reading when I have the luxury to do so, not when it will sabotage my chances of being successful at other important activities.  So now to get out the door and meet this goal.