If you stick with the definition of spirituality as a peaceful internal state (a.k.a. deep, dreamless sleep while awake), then you will ignore some of the hallucinatory experiences that are bound to happen when you sit in silence (studies have shown that, in such circumstances, the mind often creates elaborate experiences and stories that are reminiscent of dreams) and refrain from interpreting them as something otherworldly.
Gudjon Bergmann, More Likely to Quote Star Wars than the Bible: Generation X and Our Frustrating Search for Rational Spirituality
generation-x, meditation, rational-spirituality