Answer is Orthopnea.
Orthopnea is the sensation of breathlessness in the recumbent position, relieved by sitting or standing.
Two uncommon types of breathlessness are trepopnea and platypnea. Trepopnea is dyspnea that occurs in one lateral decubitus position as opposed to the other. Platypnea refers to breathlessness that occurs in the upright position and is relieved with recumbency.
