we just got a kitten 2 weeks ago, 12 weeks old today.
fuck me the thing is mental!
just like you say tho, sleeps alot all day, then about 10pm the thing goes crazy!
we also have another cat thats 3 years old, got the kitten as company as his brother was run over last year
this littleun is female and kicks his arse, and has also given him an eye infection thats going to cost us at the vets tomoz....
in answer to your question, fook knows! just lock it away!
'honey' is now chewing the laptop cable as i speak, but shes far from a fookin honey