缺钙的人肌肉和神经兴奋度会降不下来，从而导致难以入睡。

Calcium: One of the Main Sleep Nutrients in ‘Failure to Fall Asleep’

Calcium is a sedative mineral and its deficiency is associated with the inability to fall asleep and the classic ‘the brain just doesn’t shut off’ symptom.  Calcium deficiency sleep disturbance in kids and adults is quite common.   

 

https://nmrc.ca/insomnia-part-1-sleep-nutrients-falling-asleep/