son of the morning

forget to take one's medication this morning

To be annoyed or irritable, or to behave in an ill-mannered way, particularly in the morning.

morning person

A person who wakes up, without difficulty, early each morning and is alert and active during the first part of the day.

son of Adam

Any man or boy; any male human.

top of the morning

A generic, cheerful greeting said to someone in the morning.