The longer you are at rest, the greater the chance the symptoms will occur and the more severe they are likely to be.
This is one of the four criteria necessary for an RLS diagnosis.
6. Symptoms are worse in the evening, especially when lying down.
Symptoms worsening in the evening is another one of the criteria necessary for an RLS diagnosis.
If your symptoms aren't worse at night, it may not be RLS. Some people with RLS, however, can have severe daytime symptoms too.