(S (S (BASENP (DT The) (JJ average) (NN adult)) (VP (VP (VBZ gets) (NP (ADVP (RBR less) (IN than)) (NP (DT the) (NP (VBN recommended) (NP (NP (QP (BASENP (NN seven)) (PP (TO to) (BASENP (NN nine)))) (NNS hours)) (PP (IN of) (BASENP (JJ uninterrupted) (NN sleep)))))))) (BASENP (DT each) (NN night)))) (PERIOD .))