10-20 minutes with a study that taking a NAP this level increases the alertness and increase the power, which not many moments like this. As a result, the range of this size, the term NAP sleep as a normal stage of sleep, or not enough NAP and dream is a rhythm that's awakened easily.
Sleep 30 minutes longer this bit of research that it is sleep apnea that may result in symptoms of numbness chueay wake up after waking, before gradually returning to the normal symptoms.
This 60-minute sleep time, identified the body as the weather improves sleep apnea affects the brain waves to send short.
90-minute sleep cycle anniversary Deep sleep and REM sleep in dream level. Lead to adjust the deflation process memories and emotions. Creative will not fall asleep and then wake up crisis tardy awakening easily.