Mom had a great day this Wednesday. She was alert, her memory was tack on and she walked with a skip in her step. It was remarkable. Then on Thursday it all went wrong. By the end of the day she couldn't really walk. I had to put her to bed 5 times. Each time she would get back out in a couple of minutes and sit there in a chair. She was tired. She would be snoozing in the chair. But she wouldn't go to bed. The day after that, she was backed to normal. Not amazing, but not terrible.
What happened? I know she didn't get as much sleep that night as she normally does. She didn't really get as much sleep that terrible day either. It's like she over used her alertness on Wednesday and paid for it on Thursday.