If your infant is pretty mellow and has lots of good quiet alert time, do you always interact during those times?

We are so busy with 2 that sometimes we put the Littlest One in the crib while she's quiet and alert while we finish doing tasks or whatever we need to do.

We spend tons of time interacting with her as well... I probably spent an hour this morning just babbling back and forth with her.

But I still sometimes feel guilty that I'm not enriching all her quiet alert times.

So what do you do? And do you feel guilty about it?