Stay awake - Update #2

Good news! I double checked the book and it does not say that I have to stay awake between 7pm and 9am. It actually says: "Tick the box if you have stayed up later than..." and boxes from 7pm to 9am. So technically, staying up all night does not necessarily mean until 9am. In fact, in London today sunrise is at 7:40am (sunset was at 3:55pm). If you don't believe me then visit http://www.sunrisesunset.com/. Hence, to stay up all night I need to stay awake until 7:40am. That is only 292 minutes or 17k seconds away, i.e. about 5 hours. (countdown) Piece of cake!