A person said to Imam Ibrahim bin Adham (Rahmatullah Alaih):

"I am unable to pray (Tahajjud) at night, so please prescribe some medicine for me."

He replied:

"Do not disobey Allah during the day, and He will make you stand before Him at night; because your standing before Him at night is among the greatest honors, and a disobedient person does not deserve this honor!"

— Imam Ibrahim bin Adham (Rahmatullah Alaih)

(Fasl al-Khitab fil-Zuhdi war-Raqa'iqi wal-Adab: 9/400)