Waking up with a sore or hoarse throat, most days, without any cold symptoms, is a common sign of overnight reflux reaching the throat and voice box. It happens more at night for the same reason nighttime reflux in general is worse: lying flat removes gravity's help, and saliva production — which normally helps clear and neutralize acid — drops during sleep. The vocal cords are especially sensitive to even brief acid exposure, which is why the voice can sound rough or tired in the morning and gradually improve through the day as swallowing and talking clear the irritation. Elevating the head of the bed, avoiding food and alcohol close to bedtime, and sleeping on the left side are the same changes that help nighttime reflux generally, and they're the first things worth adjusting here too.
