And if you have a bed partner, ask whether he or she has noticed any "choking or gasping while you snore, " he said.

CNN: Heavy snoring can be a danger sign

But you may have noticed that he has been losing his voice a little bit out on the campaign trail.

WHITEHOUSE: The White House

You would not have noticed him as he strolled round the literary festival at Hay-on-Wye every year, or even in the Strand.

ECONOMIST: Lord Bingham

You may have noticed that we are -- he is, rather, speaking quite a bit about this in these days and weeks.

WHITEHOUSE: Press Briefing

You've probably noticed how busy your doctor is as he or she zips in and out of exam rooms.

CNN: 5 ways to maximize your doctor's visit

It's as if he's saying 'I've noticed this thing, I'm like you, so you've probably noticed it too'.

BBC: AD BREAKDOWN