Sleep cycles & a calculator that tells you the best times to fall asleep depending on what time you need to wake up in the morning. How interesting- if you need to be up at this says to go to sleep at either or due to different sleep cycles.
If you have an Ink Jet and not Laser printer: Ink Cartridge Low? Not true. this totally works, my printer stopped printing, saying there was no ink, I reset the cartridge and then printed 50 more documents and the ink still hasn't run out!