Scientific Essay from the year 2017 in the subject Medicine - Pathology, grade: 1, Egerton University, language: English, abstract: Sleep plays significant health and physical roles in the body because it is linked to the humoral responses. As such, the quality of sleep acts as an indicator of one's optimal health and physical well-being. However, the quality of sleep is usually interfered with by sleep disorders. Sleep disorders interrupt sleep by causing sleep disturbances. The most common sleep disorders are insomnia, sleep apnea, narcolepsy, restless leg syndrome and circadian rhythm problems. Due to the biological mechanisms involved in sleep disorders, this paper will discuss sleep disorders and explain the role of hormones in sleep deprivation.