The constant sleeplessness, headache, and dizziness need to be analyzed in conjunction with other concomitant symptoms, past medical history, and positive signs from the current physical examination. Common causes are significantly high blood sugar in diabetic patients, cerebral infarction, insufficient blood supply to the brain, multiple arrhythmias, hypertension, cervical spondylosis, vegetative nerve dysfunction, hypothyroidism, emotional instability (anxiety, depression, etc.), brain tumors, brain metastases, advanced renal insufficiency, hepatic encephalopathy, neuropathic headache, and taking certain medications, all of which can cause mild or severe headache, dizziness, weakness, and drowsiness, which need to be analyzed on a case-by-case basis.