Leyla was a snot monster for a while and my mum told me to get some Olbas Oil for children - it really seemed to help at night. I also got some stuff that's like Vicks for babies (I think it's from Boots and called Mild Vapour Rub or something like that) but by the time I got that she was better so I don't know if it would help. Before I got that, I'd put some normal Vicks on my chest so that she could smell it a bit but it wasn't too strong or touching her skin. That seemed to help a bit too, though she wasn't very keen on the smell!