Nick Joaquin's short story "May Day Eve" begins and ends with two extremely long sentences:
The old people had ordered that the dancing should stop at ten o’clock but it was almost midnight before the carriages came filing up the departing guests, while the girls who were staying were promptly herded upstairs to the bedrooms, the young men gathering around to wish them a good night and lamenting their ascent with mock signs and moaning, proclaiming themselves disconsolate but straightway going off to finish the punch and the brandy though they were quite drunk already and simply bursting with wild spirits, merriment, arrogance and audacity, for they were young bucks newly arrived from Europe; the ball had been in their honor; and they had waltzed and polka-ed and bragged and swaggered and flirted all night and where in no mood to sleep yet--no, caramba, not on this moist tropic eve! not on this mystic May eve! --with the night still young and so seductive that it was madness not to go out, not to go forth---and serenade the neighbors! cried one; and swim in the Pasid! cried another; and gather fireflies! cried a third—whereupon there arose a great clamor for coats and capes, for hats and canes, and they were a couple of street-lamps flickered and a last carriage rattled away upon the cobbles while the blind black houses muttered hush-hush, their tile roofs looming like sinister chessboards against a wile sky murky with clouds, save where an evil young moon prowled about in a corner or where a murderous wind whirled, whistling and whining, smelling now of the sea and now of the summer orchards and wafting unbearable childhood fragrances or ripe guavas to the young men trooping so uproariously down the street that the girls who were desiring upstairs in the bedrooms catered screaming to the windows, crowded giggling at the windows, but were soon sighing amorously over those young men bawling below; over those wicked young men and their handsome apparel, their proud flashing eyes, and their elegant mustaches so black and vivid in the moonlight that the girls were quite ravished with love, and began crying to one another how carefree were men but how awful to be a girl and what a horrid, horrid world it was, till old Anastasia plucked them off by the ear or the pigtail and chases them off to bed---while from up the street came the clackety-clack of the watchman’s boots on the cobble and the clang-clang of his lantern against his knee, and the mighty roll of his great voice booming through the night, "Guardia serno-o-o! A las doce han dado-o-o."
And remembering how she had sobbed so piteously; remembering how she had bitten his hand and fled and how he had sung aloud in the dark room and surprised his heart in the instant of falling in love: such a grief tore up his throat and eyes that he felt ashamed before the boy; pushed the boy away; stood up and looked out----looked out upon the medieval shadows of the foul street where a couple of street-lamps flickered and a last carriage was rattling away upon the cobbles, while the blind black houses muttered hush-hush, their tiled roofs looming like sinister chessboards against a wild sky murky with clouds, save where an evil old moon prowled about in a corner or where a murderous wind whirled, whistling and whining, smelling now of the sea and now of the summer orchards and wafting unbearable the window; the bowed old man sobbing so bitterly at the window; the tears streaming down his cheeks and the wind in his hair and one hand pressed to his mouth---while from up the street came the clackety-clack of the watchman’s boots on the cobbles, and the clang-clang of his lantern against his knee, and the mighty roll of his voice booming through the night: "Guardia sereno-o-o! A las doce han dado-o-o!"
Yes, each of those quoted paragraphs is just one single sentence. There are also some parallels between them, notably the way each paragraph ends, with the same cry of the night watchman.
What is the purpose or literary effect of these extremely long sentences bookending the story?