Thinking about using a humidifier in the bedroom at night?

Just be sure to change the filter regularly and I don't see any trouble with it. We used to co-sleep as well, but she has to sleep in her crib now that she is crawling, I didn't feel it was safe for her anymore. White noise helps my daughter settle back down quickly when she wakes in the middle of the night, she prefers the sound of the vacuum (goofy little thing!). Teething could definitely be the cause, my 7 month old is currently working on a top tooth coming in and she is up at least 3-5 times in the middle of the night.