Does heaven exist? With well over 100,000 plus recorded and described spiritual experiences collected over 15 years, to base the answer on, science can now categorically say yes. Furthermore, you can see the evidence for free on the website allaboutheaven.org.

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This book, which covers Visions and hallucinations, explains what causes them and summarises how many hallucinations have been caused by each event or activity. It also provides specific help with questions people have asked us, such as ‘Is my medication giving me hallucinations?’.

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Observations placeholder

Professor David H Hufford and the Sitting ghost



Type of Spiritual Experience

Inter composer communication

Number of hallucinations: 1


A description of the experience

Opening Heaven's Door  - Patricia Pearson

David J Hufford, professor at Penn State College of Medicine, is the world's leading expert on this [sitting ghosts] phenomenon. Hufford discovered it through his own out-of-the-blue experience in the 1960s.

"I was a sophomore in college. I'd gone to bed early after my last final exam. I was very tired. Being sleep deprived makes this more likely. I woke up hearing the door of my apartment open, and I thought it's probably somebody coming to see if I want to go for dinner. I heard footsteps coming across the room. And then I found I couldn't move, and that was very frightening. Then I felt the bed press down as if somebody was climbing up on it; then I felt what felt like someone kneeling on my chest, and then I felt hands on my throat. I thought I was being killed. It was horrible. I had a feeling of revulsion and terror about this thing on my chest, not just because it was trying to kill me, but also because it seemed evil. I struggled to move, and when I did move it was gone. I leaped out of bed and nothing was there.
That is a very typical sleep paralysis experience".

The source of the experience

Scientist other

Concepts, symbols and science items



Science Items


Activities and commonsteps