Any advice on safest way to co sleep?

[ClareC]

My nearly 5 week old seems to sleep well from around 7pm until 4/5am waking for just 2 feeds. After this time he seems to not want to settle and I am up to him pretty constantly. If I bring him in bed with us once this happens, he will settle easily and sleep through until our toddler wakes! Bliss..... Other than I am really uncomfortable cosleeping, feel really paranoid.

I know the principles ie no alcohol etc I also lay in such a way I can't roll on him and neither can his dad, however I'm still not comfortable with it and would much prefer him in his crib!!

I seem to remember there is some kind of product you can buy that protects baby in a separate box like contraption whilst cosleeping- are they any good and what are they called?

Any other tips gratefully received! I know lots of people choose to cosleep, how do you make it work confident baby is safe?

Thankyou