I&#x27;m not sure if ability is the right word but maybe?<p>I know several people like this, my gut tells me it&#x27;s not super uncommon.<p>It was not always like this , but the older I get the less sleep I seem to need. In my 20s would feel groggy  on 5 hours of sleep, but in my 30s ( current age ) I feel groggy if I get more than 5 hours sleep.<p>I haven&#x27;t been able to &quot;sleep in&quot; since I was probably  15 or 16.<p>Some people probably call this being a morning person, to over simplify it heavily.<p>Edit: if you do some light googling there is a substantial anoint of data on the internet that claims 8 hours of sleep is too much and 6 is closer to ideal for full grown adults.  So getting 4-5 and a healthy dose of exercise does not seem in the realm of supernatural to me.  Give it a shot!  ( don&#x27;t leave out the exercise either )