What Happens If You Take 4 Sleeping Pills ???? ?

The Pain Reliever PM Kind . The Active Ingredients Are Acetaminophen 500 mg & Diphenhydramine 25 mg ( In Each Tablet) .. And In The Warnings It Says Not To Take More Than 4,000 mg Of Acetamiophen In 24 Hours .. Justt Curious Cause Taking Just 2 Like It Says To Take Isn't Making Me Fall Asleep Like It Usually Does..