I remember how when I was in preschool, one of my classmates taught me this line, "Nah, I don't feel like it." It was a way to turn down a demand or offer, and very useful I found out. In a very real way, though, this part of my own early learning represents an important element of our culture: what matters is what we feel like doing. And we shouldn't have to be bothered by what we don't feel like doing.
It's always been a struggle for me in prayer. If I only pray when or because I enjoy it, or worse, because like the idea of prayer, or still worse, because I like the idea of myself as a prayerful person, then my prayer is only a self-devotion. This is what it really means to take God's name in vain. That's why the "night of sense" is a real gift of grace; when the Spirit removes from us the natural interest, desire, and gratification we receive in prayer, then we find out if we really love God for God's sake alone.
This isn't to say that a natural interest in prayer and devotion isn't a good thing, or that it shouldn't make us feel good. If they get us praying in the first place, they're good. But we need to notice that when God takes our interest and "feeling like it" away, this is actually a grace.
When this "night of sense" happens, we have two choices. We can panic over the consolation and apparent fulfillment and good feelings we seem to have lost, and run to fill ourselves up with our drug of choice instead. This is what it means to go back to Egypt. Or we can trust in the God we cannot see, and believe that we are being led obscurely through a place where our feeling have become a desert.