Sometimes it helps to be a tough customer (or costumer?): "I've done nothing today" could spur you.
Maybe more often, it's better to find more to notice: "I feel like I've done absolutely nothing. But what have I been doing? And why? Come to think of it I have done this, this, this, this, and this - all for reasons I still agree with. This other thing, and that, and that, feel like wastes of energy. Maybe next time I could try to remember this, this, and this."
The latter is usually much more motivating for me.
So maybe I will try to remember better how I'm *not* wasting my life, to encourage it.