Riddles of sleep. From insomnia to lethargy
: The book of a scientist-somnologist reveals the secrets of sleep: how did a dream come about and why is it needed, how much should one sleep, do prophetic dreams exist, how to overcome insomnia, snoring and drowsiness. Sleeping well is very important. How much to sleep. Was Leonardo right? Most people sleep 7-8 hours: apparently this is exactly ...