Over the past week PTA he has been more somnolent and difficult to arrouse. .
 He has been less alert over the past week 
(ROOT (S (PP (IN Over) (NP (DT the) (JJ past) (NN week))) (NP (NNP PTA)) (NP (PRP he)) (VP (VBZ has) (VP (VBN been) (ADJP (JJR more) (JJ somnolent) (CC and) (JJ difficult)) (S (VP (TO to) (VP (VB arrouse)))))) (. .) (. .)))
(ROOT (S (NP (PRP He)) (VP (VBZ has) (VP (VBN been) (ADJP (JJR less) (JJ alert)) (PP (IN over) (NP (DT the) (JJ past) (NN week)))))))
( ( Over ( the ( past week ) ) ) ( PTA ( he ( ( ( has ( ( been ( more ( ( somnolent and ) difficult ) ) ) ( to arrouse ) ) ) . ) . ) ) ) )
( He ( has ( ( been ( less alert ) ) ( over ( the ( past week ) ) ) ) ) )