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 four Kings, four Queens and four Jacks. one for each of the four suits in a normal deck, therefore in a bridge or poker deck there are 12 face cards. If you are using a double pinochle deck then this answer does not apply.