Didn't Red put up a post that showed that they do video ones now. Even better if they work ok. You would have to leave an infra red light on tho, or at least some light. Not all kids will sleep with lights on.
We have a bird box withn camera and infra red lighting. It was given to us by our daughter over 2 years ago and we have just watched the nest being built, a clutch of 12 eggs being laid, ten of them hatching .... and it has all been absolutely wonderful until today when we found that the already diminished number had reduced from 5 to 2. Three dead blue tits lying alongside two live birds. THe mother is worried and perplexed and is sitting on the dead birds trying to warm them up. The other two will die tomorrow almost certainly. They were only a few days from flying
It happened the first year too, but last year they were mainly successful.
The long and short of this ramble is that the picture aint great but it is good enough. Could be the way forward when dining out near sleeping children