Yes, alcohol can affect your performance in playing some sports. It can severely dehydrate your body for up to a week depending on how much you drink. It can also make you far more prone to injury, alters the sequence of the different phases of your sleep cycle, and reduces the body to restore Glycogen, which is the energy source that you need for endurance. Moreover, alcohol increases the level of the stress. While dehydrated you’re at greater risk of sustaining musculoskeletal injuries that include cramps, change in appetite, muscle pulls and strain.