Here’s one from Kodo Sawaki:
The basis of all actions is to follow through to the end. If your mind is absent even just for a moment, you’re no different from a corpse.
(Antaiji: Kodo Sawaki- “To You”, 34)
That might sound like there’s something to be done apart from waking up and falling asleep; Sawaki goes on to say:
“It’s all about finding the correct tension for your muscles and tendons. It’s about becoming a person without gaps, about developing the proper tension and placement of muscles and tendons.”
Since the action that arises out of the proper tension and placement of muscles and tendons can only be witnessed waking up and falling asleep, I would say that what Sawaki is advising is close attention to awareness taking place.