How Does Sleep Play Into Depression?

If you're not sleeping, or if you've had a rough night, we notice that we're not as sharp the next day. And it's really hard to be creative when you're in this foggy, grumpy, irritable state because you haven't been getting to sleep for a long time. We have all these interesting mental processes that happen when we sleep. Like our brain doesn't just shut off. No, it is working through the night, and it's able to work in different ways we sleep than it does during the day. How is lack of sleep related to depression, an mental health? I especially during the pandemic, aminyou mention, how much more