Given there’s suggestions he has Parkinson’s or has dementia, it might also be the medication. Something like haldol, even in low doses, will make him sleepy.

TBF he’s old. I had trouble staying awake in class when I was in my teens and twenties. No surprise an old man has similar issues during a long day in court.

Perhaps if he hadn’t gone around calling his opponent ‘sleepy’ for years on end, people would have been more charitable and assumed he’d simply slept poorly.

They should do a permanent version of that, only way to be sure.