It was sleeping to sheathed classes since `` they .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 It)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 sleeping) (S_2 (VP_0 (TO_0 to) (VP_1 (VBN_0 sheathed) (NP_1 (NP_6 (NNS_1 classes)) (PP_0 (ATPP_0 (IN_2 since) (TICK_0 ``)) (NP_1 (PRP_1 they)))))))))) (DOT_0 .)))