(S (S (BASENP (NNP Mr) (NNP Geraldus)) (VP (ADVP (RB also)) (VP (VBD said) (SBAR (S (BASENP (NN sleep) (NN deprivation)) (VP (MD could) (VP (VB have) (VP (VBN contributed) (COMMA ,) (PP (IN with) (S (S (BASENP (DT the) (NN flight) (NN crew)) (VP (VP (VBG reporting) (PP (IN for) (BASENP (NN duty)))) (PP (IN at) (BASENP (NN 4:30) (NN am))))) (CC and) (S (BASENP (DT the) (NN flight)) (VP (VBG departing) (ADVP (NP (BASENP (DT an) (NN hour)) (CC and) (BASENP (DT a) (NN half))) (RB later)))))))))))))) (PERIOD .))