Each one of us are crazy in our own ways and love doing crazier things. Have you tried looking at the stars for 2 whole hours , just taking your sleeping bag at the terrace or balcony and simply making constellations or trying to see how clear the sky is . Have you tried taking small steps as challenges and wondering if you could finish it within the time frame. It does give you a boost when you complete the task . Like the first lesson of swimming is to be underneath the water and the trainer increases the count with each day. This might just sound hilarious . How about taking some water in your mouth and keeping it for 20 minutes straight without swallowing it! Told you, just sounded so stupid. But I guess some of us would not be able to be quiet for half an hour straight!!