Correct

夙夜

/ sùyè / 
Strokes

Definition

morning and night/always/at all times

Example

As a Noun

day and night; all the time

1
Sùyè
夙夜
yōuguó
忧国

be always concerned with one's country

2
Sùyè
夙夜
bù
不
mèi
寐

not sleep a wink day and night