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An odd thing happened to me this morning. I woke up at around 04:30 needing the bathroom so I turned on the bedside lamp and moved to stand up and get out of bed. The next thing I know I'm sprawled partially on the floor having had my leg just kind of collapse out from under me for no apparent reason.

My leg wasn't asleep as I was able to get up and walk to the bathroom but I don't know why it would have suddenly seemingly stopped working. Did I 'forget' how to stand up for an instant?

I now have a surprisingly painful friction burn on my knee from where I landed and this morning my leg felt odd but I put that down to having inadvertanly twisted it in some way when I fell as it seems to be normal now.

Something like that has never happened to me before so I found myself wondering why for a few hours today and not coming up with any sort of conclusion. I'm reluctant to repeat the experience even if it would help gather more data...