I use the JML fresh air globe which is not very expensive at all. I'm not sure whether it is the most effective humidifier in the world but seems to help and has some great glowing colours. You can add eucaplytus oil. It makes a little bit of noise, but the white noise can help with the sleeping.
I would recommend a cold mist humidifier by vicks. it makes a low buzzing sound. however, they have one version which has a night light. the light disturbed my son's sleep. they have other models without the night light. those work well. best, devi
There are some good suggestions! But still I am having some queries so would like to read the guides like- Do the Humidifiers Clean the Air? or if they does what are other benefits and some more. Hoping to have all of the answers to my queries.