Wait a second, Ran is upset because Yukari isn't hibernating? That's a new one.
I think it's like telling your kid not to stay up late, or else they won't be able to get up in the morning. Yukari's sleep/wake cycle is just on the month scale rather than the hour - if she stays up too late, she won't be able to get up in the spring.
This is supported by Yukari replying "it's already past New Year's", analogous to a kid saying "it's already past midnight".
This kind of shit triggers the repressed trauma of an age passed, when I went through all the shit for the keycards in MGS1, finally got through that bullshit, and then a friend of mine tripped on the power cord for the PS1.
Still never beat MGS1.
Yukari-sama...Mnnnh?What is it, Ran?Thkk—ah!ChssPlease get straight to hibernating!It's already past New Year's, so it doesn't matter when I go to sleep!You said that last year, and then you overslept by a month, didn't you...Oh, quit bothering me!Yukari-sama! Are you listening?How long do you plan to play video games!?I won't wake you up this year, you hear? Good grief...Vrroooo...