Lots of jobs are tiring, especially frontline government paid ones, ie NHS, police, fire brigade, teachers. Of course being in a high pressured office job is as well but there are some differences.
As a teacher I can confirm a typical day is indeed exhausting, more so since academy takeover, being micromanaged, not having your own classroom, extra duties.
So the typical day, well for me...
Get up 6am am to sort out own kids and self, drop off at nursery, breakfast clubs to be en route to work at 7.30am. Arrive 8am, fob way through all the corridors to arrive in first classroom ready for registration and make sure trolley is packed for first 2 lessons.
In come form, all full of own dramas, sorting out dinner preferences, registration, then redo for those who arrive late, uniform and equipment check, PowerPoint of daily info.
Then off they go, wheel trolley to other side of school to try to be able to hand out bell tasks and greet first class, then frantically login to get up ppt and freeze starter task while finding register.
Breathe, discuss bell tasks and starter activities, to stick into books, handing out gluesticks from trolley as unfortunately not enough in every room and basically no trust of them being flicked on the ceiling and at each other.
Teach, meanwhile addressing the toilet requests, time out passes, those who weren't here last lesson, the squabbling, chewing, phone beeps, one who is upset and crying, another who is being disruptive, another who refuses, several who dont have pens, plus so much more.
Rinse and repeat 5 times, while duty at break taking trolley, standing at your designated point, sipping from pre preprepared coffee flask, quick wee on way, same for next lesson.
Lunch mtg, detentions and extra tuition all in the same classroom while scoffing a home made warm sarnie and again flask coffee. Quick look at phone to see if any emergencies, see missed calls from DC's schools, eek ring back, takes time, please ring DH.
End of day, pack trolley full of books (all A3 size) to take home to mark and whatever commitment there is after school; meeting, extra class, mtg with parent, training, parents' evening, following up praise and consequences etc.
Stay and catch up with own P and P then drive home, picking up own DC to prepare dinner, help with hw, bath, then get on to the marking. 30 books, all of which have to have detailed feedback, stamps and points to improve in a different coloured pen and bugger you can't find the pink one!!!
Meanwhile, depending on your school, you can experience lots of disengagement, very poor behaviour, which in itself is draining.
Finally all marked, to be told the next day your feedback wasn't detailed enough and you need to access extra training.
So yeah teaching is actually pretty exhausting as it's full on, intense, high expectations from above but often cba attitude from students.
Of course every day isn't like this, some days you're not on duty and have a toilet break and a coffee leisurely within 10 mins and a free lunchtime, bliss!