When I woke up and looked at the clock, I was very surprised to find it was late afternoon.
Today, when I woke up and looked at the clock, I was very shocked to find it was late afternoon.
To my surprise, when I woke up and looked at the clock, it was late afternoon.
解りやすい表現をしてみました、
Today, when I woke up and looked at the clock, I was very surprised to find it was late afternoon.
今日、[目が覚めて](https://eikaiwa.dmm.com/uknow/questions/74188/)時計を見たら、[夕方](https://eikaiwa.dmm.com/uknow/questions/36855/)だったのにとても驚いた。
Today, when I woke up and looked at the clock, I was very shocked to find it was late afternoon.
今日、目が覚めて時計を見たら、夕方だったのにとても驚いた。surprised を shocked
To my surprise, when I woke up and looked at the clock, it was late afternoon.
驚いたことに、目が覚めて時計を見たときは夕方だった。
なんと!と強調表現したいのであれば、
What a surprise it was! what a shock it was! 文の文頭が文末に表現すればよいと思います。
What a ... で「なんという〜」のようなニュアンスになります。