1. Mentation during sleep: the NREM/REM distinction;Nielsen,1999
2. The Old Hag phenomenon as sleep paralysis: a biocultural interpretation;Ness;Cul Med Psychiatry,1978
3. The terror that comes in the night;Hufford,1982
4. The parasomnias;Parkes;Lancet,1986
5. Sensory sleep starts;Ikeda;J Neurol Neurosurg Psychiatry,1998