I have had success with overnight plops, as well. Typically I just plop for a little while (anywhere from 15 mins to an hour or two, depending on the demands of the day), then style. But I will do overnights on days when I have to get up really early and know 2nd day hair (even and updo) isn't going to be an option.
A couple things about plopping:
Hair length makes a difference. The shorter your hair, the less effective plopping will be. And even with plopping success - it will probably need/like less time in the plop the shorter your hair is.
Overnight plopping for me - I use LI, seal, and a light-ish gel. In the morning I take the plop down, usually spritz with water where it is "too dry", scrunch lightly with a flour sack or MF towel (sometimes even the one I plopped with), and then I'll either diffuse or air dry from there.
Straight out if the plop it looks a little... Odd sometimes. So I have to go through those quick steps, and it fixes any issues.
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.
Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing