I read during those times. I pick up a non fiction book on space, Zen, positive thinking, success, or a biography of someone successful/famous/smart/whatever. Those are just my personal go to topics, but I find when I'm not motivated, that reading about other people that are motivated is a big help and can lead to some inspiration.
I've recommended this book before on Hubski, but check out The River of Doubt by Candice Millard. After his humiliating election defeat in 1912, Roosevelt set his sights on the most punishing physical challenge he could find, the first descent of an unmapped, rapids-choked tributary of the Amazon. Together with his son Kermit and Brazil’s most famous explorer, Cândido Mariano da Silva Rondon, Roosevelt accomplished a feat so great that many at the time refused to believe it. In the process, he changed the map of the western hemisphere forever.
-Based on your criteria for books to read in these circumstances, I would suggest it. No time for boredom or self-pity when you're in the company of Teddy Roosevelt.