Yes, I am also doing that. My baby is taking a long 3 to 4 hour nap in the afternoon, so these days I have been pumping and saving this ebm for later. I still let him suck and suck before bed. I just top with the breast milk (or formula) if he is still hungry and refuse to suck. I think it would be ok to top him as I already got the estimulation from his sucking.

Also I will start pumping in the middle of the night, so to increase my supply. Hopefully this will work.