My grandmother doesn't sleep at night!

I experienced this with my late mum. She would last about 3 days and sleep on the 4th night, i.e. it was a 4 day cycle. I never got to the bottom of this which was not helped by an unco-operative GP.

I would try and work out if there is a pattern to your grandmother not sleeping, and contact her GP (or memory clinic) for advice on how to try and manage this.
Hope this helps,
Paco