No real advice, but wanted to let you know my 7 week old is doing the exact.same thing, he is only happy sleeping on me (which is where he is now!). It's frustrating as you still need to tend to the other children as well, I feel bad I haven't been able to spend as much time with them. Ive also resorted to wearing him in the baby Bjorn so I have my hands free to get on with other things and I've been trying to settle him in the bouncer but he will only sleep about 20 minutes there. I'm sure it wil pass eventually, just pretty exhausting for us mummies! Hope you can get some rest soon!