I could and I did, back when the hours were longer. I would start work at 8am Saturday morning and finish around 8pm Sunday evening. A couple of hours sleep when someone else carried the bleep for me was lovely when it happened (but rare).
We worked in teams of juniors at each level. The patients I admitted were the patients I looked after on the wards over the following days. I got to learn when I had been right and when I had been wrong. My immediate seniors (still juniors themselves) worked the same calls, helped with the same patients, had my back when I made mistakes (chewed me out for a few of them - I only made them once) - we were one team for 6 months and it helped. We ate curries at 4am, dozed on ward chairs waiting for blood results to refresh, drank endless cups of coffee made by nurses who had seen hundreds of us go through the mill (and are still there making coffee for the new ones, they deserve so much more appreciation), all the while studying still.
It’s all very well saying that potential med students research it - and you do, to some extent - but no amount of research compares to the reality. It’s like saying you should research broken nights before you have children; the first experience is never like you’ve been led to believe!
It’s much worse now with shift based systems. It seems the old idea of “the firm” is gone. My SHO and registrar pretty much held me together, and I did the same in subsequent years for my juniors.
I’d still recommend medicine as a career to my boys, if they have the desire to head down that route. I’d stay out of the NHS though, and train/work abroad.