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.
Players and Cards. The game is best for seven players. Any number from two to eight can play, but with fewer than about five players the game becomes less interesting. A standard deck of 52 cards is used and the cards rank from high to low A-K-Q-J-10-9-8-7-6-5-4-3-2.