Just curious to this question.
I know when I was young, every single morning the first thing after opening my eyes, would be a big and slow stretch as I stood up.
That has been lost though for years now, rather now I awaken in bed and basically have to roll, or slowly get myself, up and off.
Very rarely, maybe a couple or few times a year, do I feel the need to stretch like I used to; it was a good, actually a great, feeling and was the best way to start the day.
I do force myself to stretch often, and at times during mid sleep awakenings I'll get out of bed to do stretching exercises (which helps me get back to sleep), but that is most definitely not at all the same thing...
No idea if persons without Narcolepsy, lost or maintain such, with age?.