Thanks for the question,
I have spent a lifetime avoiding my emotions so
I do not know all of the effects on my mood, but my blood pressure is lower post class.
The first few classes, I had a huge emotional release, finally I was taking time for myself. ( not so huge that anyone would notice ), but a step to self care.
Being with fellow cancer patients and companions, not having to explain, not being your illness. Getting to be yourself.
Depression is 'common' post cancer, even when treatment is sucessful.

Some of poses have benefits that you can practice at home, for headaches, etc.

With my energy level low it is difficult to get up to go, and when I do I have never been disappointed.

The instructor is wonderful, tucking in our blankets, making sure we are as comfortable as possible. It was difficult to accept being taken care of at first, in a nurturing way, compared to T or Doc whose 'touch' " attention' is clinical.

The hour and half goes by so quickly.
If you need to sleep it is just fine, a moment in the week, that helps you focus on how you are in the present, gently bringing yourself back into the classroom as you mind wanders with focus on your breath, knowing that you are really alive in the present. Freedom to let go of worry after noticing, it will still be there after class.
Just noticed it is about getting in touch with all of me, mind, body and spirit. Yoga does not confict with my faith.

There are many styles of yoga, so it can be what you need it to be.
G1