Is it normal that i can't think after 9pm?
When i get home from school im barely alive i shower and it wakes me up a bit but not to a great extent. Anyway i start working straight away like starting 5pm up till 9pm. AFter that i just can't anymore, i cant concentrate, it feels like my brain dosent take anything in, im doing my a-levels right now and i am working my butt off, i usually sleep at like 11 and i know that means i could fit in another hour but im just too damn tired. My friends can stay up till 12 working, they'll text me at 10 telling me how there gonna start maths and then are shocked that im not working. Is it normal?