Humidifier Questions (XP Oct 2011)

btsrc5

DD has a bit of congestion, so I pulled out our cool mist humidifier last night to try.  I have never used a humidifier before.

I had it running on high all night long.  The directions say it can't be on the floor, on wood furniture or on a towel, so I had it sitting on an overturned laundry basket about 3 feet from the co-sleeper and our bed.

Should I have noticed a difference in the air??  Because I didn't. 

I know it was working because I saw the mist coming out.  I just don't know if it needs to be closer, or if our room is too big for the air to be saturated (it isn't that big of a bedroom), or if having our ceiling fan on made a difference somehow? 

Thanks!