This post is just a plug for this post, which was eye opening for me. Random quote:
It was so enjoyable in a sort of delirious and relaxed way. My brain felt slower, so I couldn’t worry as much about the future. I couldn’t multi-task too well, so I just made my way through one thing at a time. I was too tired to be irritable with my kids and partner.Jean Hsu
I can relate to this, especially if the tiredness is well earned. If I go on a long run then feel exhausted and sleepy all day afterwards, that’s a blissful feeling.