I woke up in the middle of the night and couldn't get back to sleep for some reason.
I was wide awake during the night and couldn't fall asleep again.
この場合、次のような言い方ができますよ。
ーI woke up in the middle of the night and couldn't get back to sleep for some reason.
「夜中に目が覚めて、なぜか眠れなくなった」
to wake up「目が覚める」
in the middle of the night「夜中に」
to get back to sleep「また眠りにつく」
ーI was wide awake during the night and couldn't fall asleep again.
「夜中に目がぱっちり覚めて、眠れなくなった」
to be wide awake「すっかり目覚める」
during the night「夜中に」
to fall asleep again「また眠りに落ちる」
ご参考まで！
カナダ 
