I also found the pgce the toughest year of my life. It's a constant juggle of course work, planning for placements, delivering scrutinised lessons, evaluations, lectures, dissertations......
Saying that, my ds was 3 when I did mine, and had been in the same nursery for 2 years, so his life didn't really change much. His bedtime was fairly early, so I could work in the evenings.
The nqt year was gruelling and gruesome. I was with a bunch of very unhelpful and 'established' teachers who wouldn't even deign to show me where the paper was kept on my first day! The biggest problem was my lack of class management skills. Class management, I quickly found, was needed before the teaching could even begin.... these vital skills weren't given the necessary precedence on the course. (GTP students, I feel, are getting a far more realistic training and experience, as they do so much more class teaching.) So that first year was a massive learning curve and a bit of a confidence knock....... but I'm sure it made me a stronger person!! 
I love the job now, 16 years down the line. It is still hard work, but the children keep me smiling though!