He doesn't hate work or like sleeping, he was in his 20's when he got the job but is now in his 60's. He was a Master Farmer and had some parenting skills when he started, but it doesn't even seem like he's off farming or making babies. He's just daydreaming I guess!
You aren't trying to make the chief farm or build or research, are you? The chief doesn't sully his hands with the work that peons can do. All he'll do is supervise.
On that note, sick people will always make him go worry over the sick; if you let the fire go out, for instance, sickness will spread, and after checking on the sick, he won't go back to work when they're healed.