Sleep

Sleep is a naturally recurring state of mind characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly allvoluntary muscles, and reduced interactions with surroundings.^[1] It is distinguished from wakefulness by a decreased ability to react tostimuli, but is more easily reversed than the state of hibernation or of being comatose. Mammalian sleep occurs in repeating periods, in which the body alternates between two highly distinct modes known as อ่านเพิ่มเติม