the only available avenue, as during a dream both the body and vocal faculties are paralysed. Spooky signs About 90 per cent of lucid dreams have been categorised by LaBerge as dream-initiated lucid dreams (DILDs). These occur while dreaming, most commonly when the dreamer is in the middle of REM (rapid eye movement) sleep, a state characterised by brain activity and muscle relaxation. For some reason, lucid experiences tend to cluster towards the end of the night, becoming more likely with each successive REM episode prior to awakening. The start of lucidity is marked by pauses in breathing, brief changes in heart rate and altered galvanic (electrodermal) skin response. The other 10 per cent, known as wake-initiated lucid dreams (WILDs), usually occur suddenly after a period of awareness of having woken from a dream. Many people intuitively feel or know that the borderland between sleeping and waking has more than its share of strangeness. WILDs share similarities with both out-of-body experiences (OBEs) and sleep paralysis -- in particular their associated vibrating, buzzing and rushing sensations. During an episode of sleep paralysis, a person is partially awake but has great difficulty in moving or speaking and often feels they are struggling to pull out of a foggy semi-sleep state. This paralysis is more common at stressful times and, according to some surveys, nearly half the population has experienced it at least once. Most find it somewhat frightening, especially when accompanied by a common sensation of pressure on the chest that in