What does "~から~" mean in "覚めてからその後寝られず"?


Context:

> 今朝は5時半に目が覚めて **からその後** 寝られず、一日中眠たかったです。

What does "から" mean in this context?

If it means "after/later", are "から" and "その後" repetitious?




You can translate から as "since" and その後 as "after that" or "thereafter." It is
redundant. "I woke up at 5:30 and from then on couldn't get back to sleep. I
was sleepy all day."




You can translate から as "since" and その後 as "after that" or "thereafter." It is
redundant. "I woke up at 5:30 and from then on couldn't get back to sleep. I
was sleepy all day."

