http://www.galactic.org.ua/Prostranstv/pf1.htm
There is an idea to develop on the basis of this sensor-detector device, like the well-known "Dream-3", which would give a hint to the sleeping person in deep sleep that he is sleeping and waking, but not the man himself, and his consciousness. To do this, the alarm must be light and of a different type, for example combined binaural rhythm...<the Fourth phase of sleep is a deeper sleep. The EEG — Delta waves, breathing and heart rate slow, body temperature and brain is slightly reduced. And suddenly after 20-30 minutes of deep sleep, the brain returns to the second phase of shallow sleep. It's like her brain starts to reverse and tries to Wake up. But instead of waking up, that is, the return in the first phase of sleep, the brain moves on to the fifth phase, called "REM-sleep". A characteristic feature of this phase — rapid eye movement from side to side (rapid eye movement — hence the name phase, in contrast to NREM — nonrapid eye movement). Sleeping have almost completely lost the tone of muscles — the so-called atonic, only work the tiny muscles of auditory ossicles, extraocular muscles and the diaphragm. But EEG of the brain becomes the same as the pillow. Quickens heart and respiratory rate, temperature and pressure. REM sleep lasts about 10 minutes or so. By the end of the night in the last cycles, the duration of REM sleep increases. It turns out that sleeping in complete immobility, the brain is extremely active. Because of this amazing combination of characteristics of REM sleep got its second name — "paradoxical sleep". After the REM phase ends, again follow in strict order of second, third and fourth phase.