Not enough sleep or disruptions to the sleep-wake cycle (such as those that may occur with shift work or travelling to a different time zone) cause the physiological state known as fatigue. Staying awake for 24 hours leads to a reduced hand-to-eye coordination that is similar to having a blood alcohol content of 0.1.
There are 13 hearts in a standard 52 card deck. There are also 13 diamonds, 13 spades and 13 clubs.
Though 60 card decks need a lot more thought in the deck creation then the 40 card deck. Really I have been playin with a 60 card deck forever, and what I noticed is that I will almost always win against a deck that is running 40 cards. The reason is simple. 40 card decks really only have so many combos and stratagys.