The fact that there are always a few jerks during daytime sleep may be a normal physiological phenomenon, or it may be caused by mental stress, calcium deficiency, or focal epileptic seizures. 1. Physiological phenomenon: During daytime sleep, especially shortly after going to sleep, part of the brain nerves are still in a state of excitement, which may show a few jerks during sleep. This is a normal physiological phenomenon, no need to worry too much, and no special treatment. 2. Mental stress: If the recent psychological stress is too large, resulting in mental emotions for a long time in a state of excessive tension, even when the brain can not be completely relaxed during sleep, it may show the phenomenon of always have a few twitches in bed. 3. Calcium deficiency: due to calcium deficiency in the body, resulting in low calcium levels in the blood, causing muscle contraction, you may always have a few twitches in your sleep. 4. Focal seizures: some epileptic patients may have focal seizures during sleep, which may show the symptom of twitching a few times during daytime sleep. There may be other reasons why you may have a few jerks during the daytime, so you should seek medical attention as soon as possible to identify the cause and then give targeted treatment.