OK, I'm guessing that the last start prior to your no start may have been a very short run, like to move the car in or out of the garage for instance. You probably have the engine in a flood condition. With the key off, floor the gas pedal and crank the engine. When it seems like it is getting closer to starting, lift the pedal off the floor slightly but keep cranking. It may take a 20-25 second cranking period, but that's what it takes. If it starts, be sure to leave it running for a bit; taking a drive to fully warm it up is even better.
Good luck!