"I'm worried if I can stay up all night."
"I'm worried if ~" 「〜か心配」
"I can stay up" 「起きていられる」
"all night" 「一晩中」・「朝まで」
"I'm worried about if I can stay up til morning."
"I'm worried about if ~" 「〜か心配」
"til morning" 「朝まで」
"I hope I can stay awake til morning."
"I hope ~" 「〜ように」
"I can stay awake" 「起きていられる」
I'm worried about whether or not I will be able to stay up until morning.
"朝まで起きていられるか心配"
- I'm worried about whether or not I will be able to stay up until morning.
- I don't know if I'll be able to stay up.
- I'm a little worried about being able to stay awake all night.
- I'm not sure I will be able to stay up all night/until morning.
オーストラリア 
アメリカ合衆国 
