I lay awake waiting until I judged it must be about two o'clock in the morning.
( I ( ( ( lay awake ) ( waiting ( until ( I ( judged ( it ( must ( ( be ( about ( two o'clock ) ) ) ( in ( the morning ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD lay) (ADJP (RB awake)) (S (VP (VBG waiting) (SBAR (IN until) (S (NP (PRP I)) (VP (VBD judged) (SBAR (S (NP (PRP it)) (VP (MD must) (VP (VB be) (PP (IN about) (NP (CD two) (RB o'clock))) (PP (IN in) (NP (DT the) (NN morning))))))))))))) (. .)))
I assumed that it was two o'clock in the morning. 
( I ( ( assumed ( that ( it ( was ( ( two o'clock ) ( in ( the morning ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD assumed) (SBAR (IN that) (S (NP (PRP it)) (VP (VBD was) (NP (NP (CD two) (RB o'clock)) (PP (IN in) (NP (DT the) (NN morning)))))))) (. .)))