1) I suppose that people sleep probably from 15 till 30 years in all their lifetime.
2) I think it isn’t a good idea to sleep more at weekend because it will not fix anything. If you usually wake up at 8 am, you shouldn’t break the regime of your sleep, it will be very bad for your organism.
3) Because all students have to keep up doing all their homework and than sleep for 8-9 hours to feel good for all day.
4) If it continues, lack of sleep can affect your overall health and make you prone to serious medical conditions such as obesity, heart disease, high blood pressure and diabetes.
6) Their feelings are aggravated. Blind people have a very good imagination.