Snooze button

I can't believe it's taken me until my 20s to discover the snooze button on alarm clocks. Now that I have, it's been a love/hate relationship. Why is it that it always seems an extra 10 minutes of sleep will make the difference between waking up rested or exhausted? It doesn't make a difference--the coffee will wake you up just as well now as it will a few minutes from now. What I do like is how an early wake-up does really make you appreciate a good cup of joe.. and by "joe" I mean instant Nescafe packets and not 粥.