I never used to sleep in my chair, couldn't sleep unless I was in bed. Now I am older I do occasionally doze and waken to realise I've missed the end of a TV programme.
My husband has always 'dropped off' in his chair in front of the TV, even as a young man his eyes would droop and he'd be dozing (but never deeply enough to miss a change of programme if I'd found the remote).
Now he's older he's soundly asleep a few minutes after sitting down and I hesitate to waken him because he jumps out of his skin (which I'm sure isn't good for him).
Now he's retired, and the weather isn't encouraging him into the garden, he spends most of the day asleep or semi asleep.
My father was the same, so was his father and I know my 40 year old son has the same habit.
When he comes to bed he's asleep almost as soon as his head hits the pillow.
Is this a 'man-thing'? And is it a good thing? Added up I reckon he sleeps 12 - 14 hours a day, every day.