My OH has recently started giving deep sighs. He`s 82 and never had asthma but he can no longer walk, is incontinent, has failing memory. I`ve put it down to finding Parkinson`s such a drag because it is most noticeable when he`s having to get up in the morning and if he`s particularly tired.
I hope that your OH can explain the sighs to you, if not perhaps your P`s nurse can help.
Good luck with it all