much KNEEded rest

My mother just had her second knee replaced this morning. I have slipped away to let her have some rest. She is such a caring mother she will not sleep if we are in the hospital room because she is to worried about my sister and I needing something.
I have to drive several hours back home tonight to be at work tomorow morning and I hate to leave her but I will be coming back to help her on her first few days back from the hospital.