even as i valiantly struggled to remain interested , or at least conscious , i could feel my eyelids ... getting ... very ... heavy ... 
(ROOT (S (SBAR (ADVP (RB even)) (IN as) (S (NP (PRP i)) (ADVP (RB valiantly)) (VP (VBD struggled) (S (VP (TO to) (VP (VB remain) (ADJP (ADJP (JJ interested)) (, ,) (CC or) (ADJP (ADVP (IN at) (JJS least)) (JJ conscious))))))))) (, ,) (NP (PRP i)) (VP (MD could) (VP (VB feel) (S (NP (PRP$ my) (NNS eyelids)) (, ...) (VP (VBG getting) (, ...) (ADJP (RB very) (, ...) (JJ heavy)))))) (. ...)))
(ROOT (S (SBAR (ADVP (RB )) (IN ) (S (NP (PRP )) (ADVP (RB )) (VP (VBD ) (S (VP (TO ) (VP (VB ) (ADJP (ADJP (JJ )) (, ) (CC ) (ADJP (ADVP (IN ) (JJS )) (JJ ))))))))) (, ) (NP (PRP )) (VP (MD ) (VP (VB ) (S (NP (PRP$ ) (NNS )) (, ) (VP (VBG ) (, ) (ADJP (RB ) (, ) (JJ )))))) (. )))