Sleep disturbance after TBI is extremely common, yet it has been relatively ignored by researchers. In a 2008 study it showed that insomnia, largely goes undiagnosed. Sleep problems and deprivation can severely compromise the recovery process and lead to worse outcomes. Those suffering from sleep problems after TBI should go to the local hospital and sign up for a sleep study, which can identify the particular problem. Sleep apnea, if caused by TBI, can lead to cognitive problems and a shortened life.