I am not comfortable with the rhythm of the day. The rising of the sun, the need to have food and water, attending work meetings, waiting for the sun to set so that I can sleep in order to wake up again the next day and repeat this cycle.

Why has this recurring ordeal been set in place without my consideration? Why does the time march on and why can’t things stay the same forever ? Why this constant change and feelings of discomfort ?

It is like sitting in an examination hall tied up to a chair and being asked to answer questions which have no meaning. There is also an invisible invigilator/examiner who sees how you are answering the questions and will also check them at the end. The answer key is accessible only to the invigilator and you are expected to give correct answers according to that answer key.
If your answers are correct, you would be released from your chair and pushed into an eternity of happiness and comfort against your wishes.
If your answers are incorrect/not as per the answer key of the invigilator, you will be assigned a different chair with similar questions and similar chains. This will also go on for eternity.

The pupil will always be anxious. Hence the pupil starts worshipping the invigilator/examiner requesting them to ignore the wrong answers.

The promise of an eternity – of bliss or of agony is not helpful unless you know the reason. And the absence of eternity makes everything look transient.

In that sense, Sisyphus was lucky because he knew that eternity exists and that he was pushing a stone up the hill for eternity because he was being punished for a crime.
Luckily he also knew the crime that he had committed and hence the punishment of futile labour was understandable to him.

Maybe that’s why one can imagine Sisyphus to be happy but find it difficult to be happy themselves.