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The idea behind adding salt to honey is that an extremely low sodium intake could activate stress-related systems in the body. Supporters of the remedy suggest that restoring a small amount of sodium may help the nervous system relax.
This reasoning is largely based on research involving sodium restriction or depletion. It does not establish that a person eating a typical modern diet will sleep better after consuming extra salt at bedtime.
Most people already obtain sufficient—and often excessive—sodium from their regular diet. Adding more salt is unlikely to correct a deficiency unless one actually exists.
There is also no convincing clinical evidence that sea salt, pink salt, or another specialty salt has a unique sleep-promoting effect.