Depending on the source, it is also possible this is a trick question. If height means "the distance from the ground to the top of your head," then the question is unanswerable, for the reasons stated in the other response. But I would say that this is not what height means. Height refers to the distance from your feet to the top of your head when you are standing. Therefore, a 7 foot tall person is STILL 7 feet tall, regardless of whether they are sitting, lying down, curled up, etc.