Consider the following premises. For all x_5, x_5 will drink water if and only if x_5 is a politician. For all x_5, if x_5 drinks water, then x_5 is sleeping. For all x_5, if x_5 sleeps, then x_5 is drinking water. For all x_5, x_5 is not a politician. Can we infer the following from them? There is at least one x_5 for which x_5 will sleep.
 From the fact that for all x_5, if x_5 drinks water, then x_5 is sleeping, and that for all x_5, if x_5 sleeps, then x_5 is drinking water we can infer that for all x_5, x_5 will drink water if and only if x_5 will sleep. From the fact that for all x_5, x_5 will drink water if and only if x_5 is a politician, and that for all x_5, x_5 is not a politician we can infer that for all x_5, x_5 will not drink water. Finally, from the fact that for all x_5, x_5 will drink water if and only if x_5 will sleep, and that for all x_5, x_5 will not drink water we can infer that for all x_5, x_5 will not sleep, which contradicts that There is at least one x_5 for which x_5 will sleep. Therefore, the answer is no.