Dialog 1 draw a blank [ 思い出せない ]

Angela:I saw you on the quiz show last night!
Yukio:I'm embarrassed, though! The host asked me an easy question but I drew a blank.
Angela:You always know the answers when we're watching the shows at home.
Yukio:Yeah, but not when I'm in front of a lot of people.

Dialog 2 hit the sack [ 寝る ]

Angela:Are you alright?
Yukio:Yeah, I'm alright. Why?
Angela:You have big bags under your eyes and you look really pale.
Yukio:Oh really? Maybe I should hit the sack a little earlier.
Angela:You should. That's one of the secrets to living a long life.