Apnea hypopnea index ahi the ahi is the number of apneas or hypopneas recorded during the study per hour of sleep. However this article focuses on mild sleep apnea the problems lack of treatment can cause in your life and the treatments available for this manageable diagnosis. Sleep Apnea Is Considered A Serious Threat To Your Health Because Ahi 5 per hour. What is considered moderate sleep apnea . Severe sleep apnea is a serious and sometimes life threatening condition. Mild to moderate sleep apnea is also considered as something that s separate from severe sleep apnea when it comes to prescribing treatments. If you have moderate to severe osa a lot of information and treatment options are available to you. Oral appliances are generally recommended for mild to moderate sleep apnea patients and not for those with severe sleep apnea. Sleep apnea also spelled sleep apnoea is a sleep disorder where a person has pauses in breathing or periods of shallow breathing during sleep....