Previously it was shown that the Passy-Muir speaking valve was safe to use during sleep in children. There were no adverse cardiopulmonary events seen while wearing the speaking valve during sleep. However, trans-tracheal pressure was not measured while these children were asleep wearing the Passy-Muir speaking valve.The investigators hypothesize that patients who tolerate speaking valve while awake will have similar trans-tracheal pressure measurement when asleep as when they are awake.