Your Result
You’re not sleepy. You’re carrying too much invisible information.
You may look perfectly calm from the outside. Internally, however, you are managing a small international airport.
Your tiredness comes from rarely being fully finished with anything. Even while resting, part of you remains on duty, checking what might have been forgotten. This does not mean you are disorganised. It often means you are extremely good at anticipating what everyone will need.
What restores you is not simply doing less. It is having fewer things that only you are responsible for remembering.