ttc with a busy schedule

So we are trying for our 2nd kiddo and it is hard! we both work full time (he on days and I'm a night shift worker) and we have a 2 y.o. getting the stars to align is easier than finding time for getting down to business. when he tells me hes too tired i silently get pissed, like "suck it up! you want this too!" uuuhg. I'm 35 and feel like my window for a 2nd baby is closing soon...