> If I take my children’s devices away at 8pm, then they go to bed by themselves after 9, have a good sleep and ready for school. You have forgotten to mention

> If I take my children’s devices away at 8pm, then they go to bed by themselves after 9, have a good sleep and ready for school. You have forgotten to mention the age of your children. (Noting that there is a change in circadian rhythm - around 20:30 up until puberty, and then much later - 23:00 or so for late teens - and then later it shifts back earlier. This is fairly well understood and agreed science. So for children under 13 or 14, you'd expect comparable sleep patterns to adults - but for that 15-20 range, not so much.)