I have a friend that this happens to, her doctors say its from not getting enough sleep. her body can take only so much of not sleeping before it will experience psychosis (for her it's abnormal thinking patterns where she ends up not knowing what she is doing, sort of like amnesia)

theres a woman who comes to the crisis center groups who this happened to. with her its malnutrition, anemia and dehydration. when she doesnt get the right amounts of food and water the chemicals, vitamins and minerals it affects her short term and long term memory.

I end up having memory problems and doing things I dont remember when my medications are not working right or are on the wrong dosages.

I used to have this problem related to having dissociative Fugue, Dissociative amnesia and Dissociative Identity Disorder.

my grandmother has this problem of doing things she cant remember, hers is from having Alzheimer's disease.

A lot of people we treat at the mental health unit have memory problems like this with depression, bipolar disorder and self injury.

Some people I know get this same problem when taking cold medicines, allergy medications, and sleep aids.

my suggestion talk to your physician, and mental health people. they can do tests and then tell you why your body is reacting this way and how to fix it.