It is not a mystery that we need at least 8 hours of sound sleep to function at our best. When running on less than 8 hours, it is not unusual to feel tired, groggy and just out of it, according to a doctor who may treat Lee G. Lovett.. Our cognitive thrinking skills also dramatically decrease with the less sleep we have. http://well.blogs.nytimes.com/2014/12/15/poor-sleep-tied-to-brain-changes-of-dementia/ Sad to say that now there is another reason to turn off the TV and get that much needed sleep. A recent study has shown that people who suffered from sleep apnea, were four times more likely to have incidents called microinfarcts, which happens when there is a lack of oxygen in the brain. With this in mind, it is a good idea to again, get the sleep your body needs, but also if suffering from a sleep disorder, do not ignore it. Sleep apnea can have serious health effects and now with certain types of dementia possibly linked to it, ignoring it can be devastating later on. Most people these days are active elders, but these are the ones who take care of themselves.