after an all nighter

sleepy / drowsy

to stay up all night, to burn the midnight oil

being awake all night / vigil, wake

daybreak / (in compounds) end (of a certain period of time), or immediately following / (in compounds) beginning (of a year, month, day, etc.)

morning

morning

the morning

(archaic) the morning, morn / (archaic) the morrow, next morning

the morning / an imperial court / a country governed by a monarch / a bustling place, such as downtown / an imperial reign or dynasty