init.sage doesn't work for the notebook server?

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Hello!

I have the same problem as in Is there a way to prefix all sage code in order to include a custom module?, but the init.sage appears not to work with notebook's worksheet. Here is what I have:

$ cat ~/.sage/init.sage 
import numpy as np

then inside Sage I have:

$ ./sage 
sage: np
<module 'numpy' from ....>

But then I run notebook() and create a new worksheet, inside that worksheet session:

np
NameError: name 'np' is not defined

So I assume that the script was not executed for the worksheet.

Is there a way to create sage.init but for the worksheets?