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.
There are twenty even cards in a standard deck of cards. In each deck of playing cards there are four suits: spades, hearts, diamonds and clubs. Each suit goes from one to tâ¦en, then jack, queen, king. The even numbered cards are 2, 4, 6, 8, 10. That's five in each suit, times four suits: 5x4=20.