The man had probably heard him urinating or maybe even noticed the change of his breath as he awoke.
( ( The man ) ( ( ( had probably ) ( ( ( ( heard ( him urinating ) ) or ) ( maybe even ) ) ( ( noticed ( ( the change ) ( of ( his breath ) ) ) ) ( as ( he awoke ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN man)) (VP (VBD had) (ADVP (RB probably)) (VP (VP (VBN heard) (S (NP (PRP him)) (ADJP (JJ urinating)))) (CC or) (ADVP (RB maybe) (RB even)) (VP (VBN noticed) (NP (NP (DT the) (NN change)) (PP (IN of) (NP (PRP$ his) (NN breath)))) (SBAR (IN as) (S (NP (PRP he)) (VP (VBD awoke))))))) (. .)))
The man heard his urine hitting toilet water as his breath changed.
( ( The man ) ( ( ( heard ( his urine ) ) ( ( hitting ( toilet water ) ) ( as ( ( his breath ) changed ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN man)) (VP (VBD heard) (NP (PRP$ his) (NN urine)) (S (VP (VBG hitting) (NP (NN toilet) (NN water)) (PP (IN as) (NP (NP (PRP$ his) (NN breath)) (VP (VBN changed))))))) (. .)))