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Syncope (loss of consciousness) can occur if your blood pressure were to drop below some threshold that is dependent on your health situation.
If you are really fit and healthy, I wouldn’t worry about it too much.
If it happens again, you should see a doctor about it.
On a spring day in 2016, I lost consciousness while drinking my morning coffee at the kitchen table. I was on my side in a pool of blood on the ceramic tile floor. My coffee cup hit the floor and shattered before my head landed on the broken glass.
My wife discovered me and shook me into consciousness, and then hurried me to the hospital.
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