Tired after rest

Just had a full Sunday all to myself, alone. Just resting, eating well, not working, watching calm content, feeling relaxed. I even went to bed earlier than usual, and felt so relaxed I fell asleep almost immediately.

One of those nice, slow, restful Sundays any parent would die for.

But I woke up on Monday morning feeling exhausted.

What the actual fk!!?

I know my body needs it. So I give it what it needs.

But it seems the more I rest on the weekends, the more tired I get.
And on the weekdays when I have to work and move out of necessity, I feel more rested.

WHY?!?

What kind of sick joke is this