My dad dreads the thoughts of laying around in the sun. He always wants to do something. I do not see a retirement in his case because I know it's already in his blood to do something valuable with his time. Whether it's working on the soil, creating new homes for his chicks, repairing broken outlets at home, and working on the next housing plan for a client. He works round the clock until his head finally hits the bed.
I bet you he sleeps well at the end of the day. Most people who have trouble sleeping, actually have trouble working enough I think. It isn't just physical work, but also mental. those who feel they have put in a good day of work, tend to sleep well.
He definitely sleeps well. So you are right.