As full as a teaspoon

/az,əz/ /fʊl/ /az,əz/ /ə/ /ˈti spu n/
idiom
Used to describe the degree of fullness when it is equivalent to the volume of a teaspoon.
Teaspoons are used for adding sugar and stirring hot drinks, which is considered to be 5 millilitres when used as a measurement.

**feeling sleepy, eat a teaspoon of food, then go back to sleep.**
MUM: "Wait! Eat before you sleep!"
Ariel: "Goon night! I'm AS FULL AS A TEASPOON now."