instead , it 'll only put you to sleep . 
(ROOT (S (ADVP (RB instead)) (, ,) (NP (PRP it)) (VP (MD 'll) (ADVP (RB only)) (VP (VB put) (NP (PRP you)) (PP (TO to) (VP (VB sleep))))) (. .)))
(ROOT (S (ADVP (RB )) (, ) (NP (PRP )) (VP (MD ) (ADVP (RB )) (VP (VB ) (NP (PRP )) (PP (TO ) (VP (VB ))))) (. )))