Among the daylight savings areas in the Midwest region, how many postal points are there in Illinois?
postal points refer to zip_code; the daylight savings areas refer to daylight_savings = 'Yes'; Illinois is the name of the state, in which name = 'Illinois';
SELECT COUNT(T2.zip_code) FROM state AS T1 INNER JOIN zip_data AS T2 ON T1.abbreviation = T2.state WHERE T1.name = 'Illinois' AND T2.daylight_savings = 'Yes' AND T2.region = 'Midwest'