As the human society progresses, sleep is becoming more and more of a luxury. Some people even say that 'they'll sleep all they want when they are dead', not knowing that having a lack of sleep will accelerate their 'sleeping-forever-at-six-feet-under'!
A study done by the University of California, San Diego has found that people who live the longest sleep for six to seven hours each night. (Click on LINK)
Those who lack sleep have been shown to be high at risk where weight gain, hypertension and Type 2 diabetes are concerned.
I wrote about the four stages of sleep and what sleep deprivation does to you back in 2013. Here's the LINK.