Pills scene is unrealistic (spoilers)

If Alice really forgot what she was supposed to do every time she went upstairs, why did she keep remembering she was watching a video with instructions the minute before? And then, the last time when she comes back and decides to grab the laptop, why did she remember she had just gone upstairs looking for something but forgetting what it was?


People with advanced Alzheimer's (as Alice is supposed to be at this stage) usually forget what they were doing altogether, instead of just forgetting the last step and going back to the previous one. Therefore, once upstairs she would have rather gotten distracted and started doing something else, forgetting about the computer and the video entirely.