Telling Time

I overheard this conversation between the boys recently. I am rarely awake before they are, but it was after 8 am.

4-year-old: (to his brothers) "Can we wake up?"
7-year-old: (to 5-year-old) "Can you go check the time?"
5-year-old: "No." (To 4-year-old) "You go do it."
4-year-old: "But I don't know how to tell the time."
7-year-old: (to 4-year-old) "Just go look and come back and tell us the numbers."
(long pause as 4-year-old comes out to check the clock)
4-year-old: "OH MY GOSH...there's an 8 on the end of it.....MOM! Can we wake up?!"