Furnace may be drunk!

So the Cooj (Wife) wakes me up this morning & says "Our heat doesnt work" So I check the thermostat, call the company, its determined the problem isnt the thermostat so I call the father in law who is all knowing when it comes to broken shit in our house.  Hes fixed damn near every problem we've had, he tries to help me over the phone but im inept, he thinks he knows the problem, but now he has to come from Toledo on  a weeknight to help us fix the furnace. Our furnace is old enough to drink, it was made in 1984. Maybe its just drunk & doesnt feel like being woken up right now.  I know how that is. A hungover furnace will ruin your day for sure.