Between the 6 of them?
 
The newly adopted has some issue we're working on. She was the runt of the littler, so she's very shy and nervous. First night she climbed in bed with us, started purring. Then peed. On the comforter, which was on us. :/ 
 
And then again the next night. And we thought she was ok but she did it again a couple of days ago. So that one doesn't get to come in our room anymore until we see the vet w/ her next week.
 
The other youngest one is 8 months, and between him and his brother of 18 months and sister of 2 years, we have our hands full. You can actually hear them as soon as we turn off the lamp on the night stand - it's like a deflagration of paws, chasing each other, running into stuff, bumping in walls and doors, jumping on our bed.
 
The 2 older ones are rather quiet at night though. They usually take their turn early in the morning. (Since we go to bed around 3 or 4, early morning for us/them is like 9 or 10).
 
But all in all - I wouldn't have it any other way. :)