Hi Mel, you can get a vapouriser from the Chemist. Vicks make one. So do Euky Bear. I have a Euky bear one and you put a few ml's of a special eucalyptus blend of oil in the water.
First time Charli had a cold and I went to the chemist in desperation, the pharmacist said they don't recommend giving cold medicines to bubs now as there is an ingredient in them that is not very good for babies, however he suggested I give her some polaromine which is essentially an antihistamine but he said it would help de-congest her nose and also help her to sleep better. Once I bought the vapouriser and the polaramine we all started to get a better nights sleep.
HTH.

Tamara