How long do you need to meditate to see results?

Although it is not an exact science, the consensus seems that to see benefits from meditation, you should aim for at least 10 minutes a day at a minimum. However, each person will respond differently, so it's important to test out longer meditation periods if 10 minutes does not seem to be making a difference for you.

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And another question, can you meditate lying down?

You can meditate lying down any time you'd like to. What's important in meditation posture is to find a pose you can hold comfortably for a long period of time. There are certain types of meditation where lying down may even be preferred. What happens if you meditate for 24 hours? It don't depend on number of hours you spend in meditation. There are people who only live in meditation most of the time uninterruptedly. If you are talking about sitting to meditate all day... nothing much will happen except little body pain due to no movement.

Then, what is the dark side of meditation?

Willoughby Britton, PhD, assistant professor of psychiatry and human behavior at Brown University agrees, noting that the potential negative effects of meditation-including fear, panic, hallucinations, mania, loss of motivation and memory, and depersonalization-can be distressing at best and debilitating at worst. And another question, can meditation cause psychosis? Conclusion: Meditation can act as a stressor in vulnerable patients who may develop a transient psychosis with polymorphic symptomatology. The syndrome is not culture bound but sometimes classified in culture-bound taxonomies like Qi-gong Psychotic Reaction.

Why you should not meditate at night?

Before going to bed, being able to simply notice your thoughts and not get drawn into them provides a restful sleep. There is no wrong time to meditate. The reason many people discourage it at night time is that you have an increased likelihood of falling asleep.