Oops, it doesn't look like 'sleep in late day' is a national day..

Other days

Buddy Day

Appreciate Yaself A Lil Extra Day

Aloxolt Day

Pampering Day

Chocolate Milkshake Day

Ponytail Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Tulip Day

Unicorn Day

Hoodie Day