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.
Example set of 52 playing cards; 13 of each suit clubs, diamonds, hearts, and spades Ace 2 3 4 5 6 7 8 9 10 Jack Queen King Clubs Diamonds Hearts Spades. Two of hearts redirects here. For other uses, see Two of hearts (disambiguation) . Six of hearts redirects here.