WIBU to buy a blow up doll,

[MammasBrandNewBag]

Dress it in a wig and milk stained pyjamas and put it in the cot with DS?

Sorry, but I laughed out loud :)

No, of course that is reasonable.

I may buy two, I could put the other in the bed next to DP and go check myself into a hotel for the remainder of the night!

Genius idea!

Totally reasonable.