Hi,

Sharing a room with 13 hamsters can at night be a little noisy for me also!!

I have found that hams ignore wood chews/sticks completly, but they do like hard edible chews (you can buy edible nylabones for this - ensure they do not contain garlic, charcoal, BHT or BHA) I buy hard edible hamster sticks which attatch to the side of the cage. The only problem is they are quite noisy when they destroy them and they only last a few hours at most (they hoard it all).

They do have a wheel I suppose so that isn't a problem.

The only real solution I can think of is expenive and is to house them in tanks/plastic storage bins so they have no bars to chew on. You could also try weaving paper in and out of the bars to stop them. Some people buy nasty tasting products such as "bitter apple" but I think that is a little mean as hamsters chew on the bars not only in wanting to escape but to also wear their teeth down.