One possible way that excessive salt intake could affect sleep is through its impact on blood pressure. Consuming too much salt can cause an increase in blood pressure, which can lead to conditions like hypertension and cardiovascular disease. These conditions are known to be associated with sleep problems, including insomnia.

In addition, consuming a diet high in salt can cause dehydration, which can also affect sleep quality. Dehydration can lead to symptoms like dry mouth, thirst, and headache, which can make it difficult to fall asleep or stay asleep. 

To sum up, while there is no direct link between salt intake and insomnia, it is important to maintain a healthy diet that includes moderate levels of salt to promote overall health, including good sleep hygiene.