Sleep needs vary considerably from one person to another, the duration required being one that enables the individual to awake feeling refreshed. It is generally considered that a short sleeper requires 6 hours a long sleeper 9 hours. Insomnia is therefore a reduction of the usual sleep time or a change in its quality leading to irritability, concentration problems and fatigue the next day. To deal with insomnia, the consulting doctor needs to eliminate any somatic cause that can lead to a sleep disorder, make an inventory of life activities, look at a major cause which is stress, food consumption, drugs such as coffee and alcohol. Furthermore, daytime activities and especially when going to sleep. Other issues causing insomnia may be restless leg syndrome preventing asleep and underlying psycho-pathologies such anxiety or mood disorders.