Per RAW, everyone gets a reflex save. A SLEEPING person gets a reflex save. A Held person gets a reflex save. A pinned person gets a reflex save. Granted, for all of these people, they are treated as having a dex of 0, but they are still allowed to make the save.
To take away somethings reflex save is unfair. If your players do it, then monsters should be able to do it back. That is very unfair to the players. To integrate this rule will spell the death of more characters than will gain in kills for the players.