Falls at night feel random when you are the one who finds the floor, the chair, or the hallway wall in the morning. They are often less random than they feel. The trip from the bed to the bathroom has several stops, and each stop asks something different of her. Before you decide what to change, find out which stop the trouble belongs to.
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Look for the pattern in the notes you already have
Go back through what you remember and what she has told you. Note where she was when she fell: on the edge of the bed, between the bed and the door, at the bathroom threshold, or on the way back to bed. Note whether she was walking, turning, reaching, or standing up from a sitting position. Note whether the light was on, and whether she was wearing shoes or slippers. You are not looking for a single cause yet. You are looking for the stop where more than one fall happened.
Signs the route is the problem
The route is likely the problem when the falls share a stop, when they happen in the same part of the trip each time, or when she mentions the same hard moment, such as getting up from the mattress edge or turning in the narrow part of the hall. The route is also likely the problem when the light is dim at that stop or when a step is only found by feel. If the falls scatter across the whole house at random times with no shared stop, the cause may be somewhere else, and that belongs with her doctor.
What to write down
For each fall or near fall, write the stop, the time as best you know it, what she was doing, the light level, and what she was wearing on her feet. After a few entries, look for a stop that repeats. Circle it. That is the stop to bring to her physician, along with the route notes, so the clinical questions go to the right person. The night log is for seeing the pattern, and the doctor is the one who decides what the pattern means.
Our note on how we write this desk explains why we anchor each piece to the walk from bed to toilet.