The 'sands of time' is a very evocative phrase often associated with the unstoppable flow of time and the impermanence of things. In the context of this Sheldon novel, it might be set in different time periods. The character Sheldon could be on a quest that is bound by the limits and mysteries of time. For example, he might be a time - traveler or someone who is trying to understand the significance of certain historical events in relation to his own present - day life. The novel could explore themes like regret, hope, and the cyclical nature of time through Sheldon's experiences.