it apparently can happen without any reason; is not related to stress or lack of sleep.
Hope things are fine now. Could it be because of always thinking about doing something and working tirelessly without actually realizing ? The active and curious mind needs some rest ? Do things to relax yourself ? I did go through crazy moments, where I would not be able to remember simple things. It just does not come to mind.
Thank you so much @sanjeevm, I also believe just like you that perhaps overthinking stuff is not a good thing, so I am learning to slow down somewhat, stop trying to fit too much into my days and am feeling much better so far! Thankfully the meds are agreeing with me as my body sometimes doesn't react well to some meds. But I will remember what you've said as I do believe there must be a reason why this has happened!