Unable to sleep well last nite

Not sure why i unable to sleep well last nite. I was having headache and Mum asked me why. Told her the reason, she scolded me and advised not to use the computer too long at home as i have been facing the office computer all day long. I told her that i will take note of this and follow her instructions. She said that she do not wish to worry over me as i should be old enough to analyse the pros and cons. Yes yes, i will measure the pros and cons.