I'm 13, and I go to bed somewhere between 10 ~ 12, depends on how much hw I have. Sometimes, I move around, unable to sleep, so actually starts sleeping at about 2~3, but sometimes, I feel so tired that I just sleep right away. I have about 7~ 10 hrs of sleep. It is so hard for me to get up in the morning, unless it is someday special - aka: my birthday, Christmas, ect.., so it would be 10 for me. I am so not tired for the rest of the day, even if I only sleep for about an hour, or not sleep at all. It sometimes is hard to sleep at night - like some nights when I'm having a sleepover or something, but it's usually not that hard.