National Football Hangover Day is celebrated on February 14 in the United States. This day is dedicated to football fans who may experience symptoms akin to a hangover after staying up late to celebrate their team's victory or mourn its loss. Many fans take the day off from work to rest and recover from the excitement of the previous night. The day was initiated by sports personality Katie Nolan, who recognized the need for a recovery day after the intense experience of watching football. Common customs include gathering with friends, indulging in food and drink, and some fans even calling in sick to work. Symptoms of a hangover can include headaches, nausea, fatigue, and dehydration, and while treatments vary, staying hydrated is commonly recommended.