Children should be able to pick their own bed times because they may need to finish something that is due the next morning and they did not do it earlier, you can stay up and do it. Also, if you went to dinner with your parents and they came back late, you should have time to finish your homework then go to sleep. Choosing your own bed time is also good because it lets you stay up however long you want. So, if you are doing homework and you want to make sure it is right, stay up and do it. Staying up later also allows you to take your time on things and not rush because it is almost time to sleep. If you can pick your own bed time it will allow you to have more free time after you finish the homework or classes you have. This is good because if you are bored of doing work, you can take a break and then go back to doing it later.
Possible reasons to not choose your own bed time are. If you stay up too late you will be tired the next day and not want to do much. This would be bad on a school day because you might fall asleep in class. Another reason is that if you go to bed too late your parents will not have any free time without you being awake. If you are always awake they will not get to watch one of their movies or talk about stuff. Something else to think about is that if you do not get enough sleep every night it can affect your health and this can be bad. The final thing is, if you do not get sleep your body cannot grow, so you will always be very short and you will be sad because all you had to do is go to bed at a good time every night.