For Apple CEO Tim Cook, "sleeping in" means waking up at 4:30 a.m. After all, that's about 45 minutes later than usual.
He reminded us of his sleeping habit with this Tweet on Monday morning:
Got some extra rest for today's event. Slept in 'til 4:30.
— Tim Cook (@tim_cook) March 9, 2015
Cook was gearing up for an event later on Monday, at which Apple is expected to unveil details about its new smart watch.