This line in Life, has locked in, multiple surprises - confusing, and disturbing, but also enlightening. The pun on rapt, I think, is the stroke of grace,

When the dry rapt of laughter
Fills their minds with tombs

.. leading in to those crypts for common people to hold onto, where grand things are fast turned into apparent nothings. I have no way of knowing what your intentions were, but I read rapt (passionate) laughter, contrasts with an allusion to drying of tears (after rapt or empassioned sedding of tears). Adding to this, rapt implies also spirits having left. So after the passionate life, is a hollowness and confused disturnbance: so the common are in need of things to hold onto (to help us sleep).

I need to disturb myself a lot more to tie the last stanzas into my understanding... wait (edit) it's all about grabbing onto hope, as false and ellusive as it may be, because there is Life and it's what we need. It takes courage. I got it!

Live long and prosper, Sir.