Oops, it doesn't look like 'i feel like crap and i need to take a nap day' is a national day..

Other days

Unicorn Day

Prescription Drug Take Back Day

Prosecco Day

Aloxolt Day

Appreciate Yaself A Lil Extra Day

Kiss A Brunette Day

Coffee Day

Boba Day

First Love Day

Tell Ur Crush You Like Them Day