it wouldnt be too hard if you did some work when hes in bed but then you wouldnt really get much you time, but if its what you've always wanted to do then you should at least consider it and maybe give it a try as you dont want to regret not doing it later in life, better to try and then if it becomes too much then re-think, im sure all teachers get stressed but knowing you have an impact on their lives must be very rewarding also