And it's bad.
Back in Year 10/11 I had such a problem because I'd stay up late, around 3-4am, and wake up for 7am, go to school, come home around 4pm and sleep till 7pm, and then carry on. I did extremely poorly in my GCSEs (it was a huge disappointment considering my predicted grades) and I think 50% sleep pattern is to blame.
Then, as I started Year 12 (3 weeks ago) I was happily sleeping around 10pm and waking up at 7am, but all of a sudden;
-I'm eating an irregular diet to my usual
-Sleeping very little (sleep at 3am wake up at 7am, usually no naps during the day)
-Feeling physically weak a lot
-Getting a bit behind with my work
-Not absorbing all of my work into my mind, like I promised I would, because I don't spend enough time revising
Any tips on how to overcome this? I've always had problems with time management and making huge timetables never work for me. And I'm up now doing coursework in for tomorrow.
Please, no nasty "sort your idiotic self out" advice.