Being new to cats, we simply don't know - will their schedule ever switch from nocturnal to daytime? We really need some sleep around here! We've attempted to get them up at different times to play with them so they'll be tired enough to sleep all night, but if we're not up at 12:30am for several hours, it's 2:30am or the latest we've gotten is 5:00am. ??? Or is this a function of age? Vet thinks they're about 12 weeks old now.