Other than dim, rather than simply switch off and on, a dimmer switch should not do anything that the existing light switch did not. Perhaps the power to the second room is a spur off your bedroom in which case you are switching the common feed to it.
If you are unsure, then perhaps you should enlist the help of an electrician. I have now rewired extensively but I had to call in help the first couple of times I came across something unusual.
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