When I have Mom 2 nights a week she won't sleep at all... does anyone else have this problem?

What does she do instead of sleeping when you are with her?

Could you clarify who looks after your mom, when? You do 6 days and sister does 1 day? You have her 2 nights and sister has her 5 nights? Or is someone else involved also?

And CM's question is relevant. Where is the care given -- in mom's place or in your homes?

You'll get more specific answers by providing a little more information.

Does this shared arrangement involve a change of venue for your mother? Or are you and your sister looking after your mother in her own home?