Ask HN: What can I do to get better sleep?

I've tried to develop normal sleeping habits over the years especially after my engagement, and I've been really good about it.

However, I have episodes where my mind is racing a million miles a second, and I can't sleep. This will be the third day that I've just powered through the day for no good reason. There is no deadline, just my mind racing at the possibilities of ideas and their consequences.

Does anyone else in the HN community have this problem? Any suggestions on what to do?