Make sure that the aftermarket brand is fine with your model though. I have been buying recycled toners at half-price for years and never had any problem.
Also yes, I’ve seen it a lot but playing with toner is described as getting instant cancer, don’t do that.
He’s a teenager, not a toddler. I would say 11PM to give him personal time before sleeping, but no more than midnight (it’s a very bad habit for everyone, even adults).