our house is stilted and there is not enough room under it for the underfloor insulation type thing that I think limeslice is referring too.

the only thing I can think of would be wall and ceiling insulation, there are companies out there that do a blow in type thing but its exxy and you need to have an electrician approve the wiring as it goes in wet.

for the floor boards, try a little talc in the gaps as it helps fill the space between boards making the squeak less. aside from carpeet, there are things like sea grass mats or you can do a floating floor over your boards. furnishings etc will only do so much.

my only other suggestion is to create white noise, I sleep with a fan running as we have a similar problem in our room but dd room is carpeted so no issue in there

hth

nae x