I have no heart problems, i have anxiety and panic syndrome, i have had heartbeat before sleep and only at night, what can be???

Anxiety shows itself: In may ways. Once can mentally obsess over things that frighten the person or do behaviors to keep danger away, e.g., ritual behaviors, checking and re-checking. Physically there can be heart palpitations, shortness of breath, sweating, sleeplessness, etc. Please go to a mental health professional for support if you think you have an anxiety disorder.