As you process and eliminate toxic build-up, you may experience a 'healing crisis.' The most common indications include fatigue, headache, minor rash, lack of mental clarity, joint or muscle ache, irritability, difficulty sleeping (or sleeping too much), or mood swings. Some people may experience multiple indications, while others have one or none. Here you have more details: http://www.globalhealingcenter.com/natural-health/what-is-a-healing-crisis.