"The fear made me unable to sleep."

Translation: Strach spowodował, że nie mogłam spać.

[lady-bug-tlen]

There's an unnecessary coma in the other answer, which suggests that the answer is wrong, while you say it's correct...

[8KAITO8]

That's right. Reported 09.09.2016.

[Jellei]

Which comma is wrong in which answer?

[8KAITO8]

"Strach, spowodował, że nie mogłem spać." The one just after the first word in the sentence.

[Jellei]

At the moment when I was commenting, it was already fixed by another contributor - so that's why I didn't see any problem.

[Ali759455]

Strach nie pozwolił mi spać.

[Jellei]

Why not, added.

[z1z2z]

I see the verb, "powodować" is part of "spowodować" , but why is this "s" added on?

[Jellei]

To make it perfective. "powodował" would mean, that such a situation happened more than once, "spowodował" refers to a particular occasion.

[Gabriel_Barahona]

Could one also say "sypiać" instead of "spać"?

[Jellei]

If we assume that it was a longer time when you were afraid (a few days at least), then "sypiać" (on many occasions) could work. Added.

[Gabriel_Barahona]

Dziękuję bardzo!

[Mrs.Mop]

Could you use lęk here. What is the difference in meaning please ?

[Jellei]

Wikipedia says that "lęk" is internal, it's a state of anxiety that may not even be caused by anything specific, a sense that something bad is coming. "strach" should be caused by a specific danger.

I don't feel like this is something that people who aren't interested in psychology are able to tell apart. I think that we can safely accept it.