ZZZoo pillows: sense of sleeping alongside somebody

Abstract

Sleep is essential to human life and is one of the three primitive desires, along with appetite for food and sexual desire. However, in recent years, there are many people who suffer from sleep deprivation. [Song and Nishino 2008] reported that sleep deprivation is not only harmful to health but also a cause of daytime fatigue, sleepiness, feelings of discomfort, deterioration in memory, and poor concentration. Secondarily, it can lead to mental and physical illness, various accidents, absence from work and poor productivity, and an increase in medical expenses.