I would try to take a taxi back to my resort. The Downtown Disney bus will still be running at that time so you have that option as well.
Resorts we've stayed at over 17 trips: ASMo, ASMu, ASSp, PC, CSR, CBR, POR, POFQ, WL, AKL Jambo, AKL Kidani, Poly, BC, YC, BWV, OKW, SSR, Swan, Shades of Green, Vero Beach
Next Trip: Thanksgiving 2013. WL and POR