What if… you suddenly stopped sleeping? What would you do after one day? Two days? Three days? Four? Five? Six?
What caused this situation? What effects does it have on you? You can try to imagine what would really happen in such an instance, or get a bit wild & woolly with your imaginings. The cause of your insomnia could be psychological, biochemical, supernatural, drug-induced, self-induced, magical… you name it.
How different would the world look through insomniac eyes? How would your interactions with others change? How would your priorities change?
Free-write or fictionalize as you please!