Green doubled his tally quickly after the restart, but Saints full-back James Pater pounced on Santiago Carreras’ dropped ball to steal possession and sprint the distance to the line.
Carreras made amends with a try of his own although Northampton started turning the screw despite Bath unloading their bench of big-hitters.
Josh Kemeny scored in the corner, Alex Mitchell followed – collecting his own grubber kick in a solo showpiece – and Sleightholme capped a superb move that saw Saints turn the ball over by their own line and sweep up the field.
Sleightholme completed his hat-trick four minutes later and while Bayliss kept Bath in touch to close the gap to 57-48, it did not last as Saints had more in the tank.
Alex Coles barged over before Freeman rounded off a blockbuster day in the closing stages.
Northampton: Pater; Freeman, Hutchinson, Dingwall (c), Sleightholme; Smith, Mitchell; Iyogun, Langdon, Kundiona; Coles, Van Der Mescht, Kemeny, Pollock, Chick.
Replacements: Smith, Fischetti, Neculai, Lockett, Prowse, Taylor, McParland, Belleau.
Bath: Carreras; Cokanasiga, Ojomoh, Redpath, C. Griffin; Russell, Carr-Smith; Kirk, Tuipulotu, A. Griffin; Jeanes, Molony, Bayliss, Reid (c), Green.
Replacements: Dunn, Obano, Stuart, Ewels, Hill, Davies, Lawrence, Coetzee.
Sin bin: Bayliss (26) Lawrence (62)
Referee: Matthew Carley
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