Can't you sleep also?
Is it well said? I want to ask if you can't sleep, like me.
Can't you sleep also?
Is it well said? I want to ask if you can't sleep, like me.
You use the word "also" when you are in positive agreement. In this case the sentence is a negative one and you would use either instead.
Can't you sleep either?
Also:
I can sleep, can you also sleep?
Yes, I can also sleep.
Either:
I'm not sleeping well, can't you sleep either?
No, I can't sleep either.
This link has a pretty good explanation about the difference between Also, Too, and Either.