Читать книгу Sleep: The secret to sleeping well and waking refreshed - Prof. Idzikowski Chris - Страница 29

As you descend further into sleep, the relaxed alpha rhythm is replaced by a faster wave form of 12-14 cycles per second called a ‘sleep spindle’ (because of the spindle shape it makes on the computer screen). At this point the systems that maintain wakefulness are letting go and the sleep-promoting systems are switching on. This stage usually lasts 30-40 minutes.