Time to leave them unsupervised?

Toby, our newest addition, and Trixie (8 mo) have been getting along really well the last few days! I was so worried that they would never like each other, but it's only been 2 weeks and they are already cuddling! There is still a lot of chasing going on, but i think it's playing, although sometimes Trixie pins him down and he squeals. Other than that, they just carry on with their own business all day, while we are at home but not necessarily watching them.
So here's the question: Can we leave them unsupervised while we sleep? I don't want anyone getting hurt!!

It seems like if they are getting along fine when you are with them, it would be fine to let them stay together all night. That is great that they are getting along well.