Dina -- my boys (male brother cats, about 3 years old) STILL go nuts as soon as the sun starts to come up. They chase each eother back and forth, over and over, and ALWAYS ACROSS BY BED, but I guess I've gotten used to it now because I hardly ever wake up anymore..
HOWEVER, this was not the case when my sister and mother visited. :nono
On the other hand, they're ALWAYS snoozing between 4:00 - 9:00 when the sun is going down.
I still love them to death.