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Salvation (2005)
            2014, "GhoshanaPatra with Narendra Modi", 2014 
Context: Usually I get up at 5, it’s a habit I have had since I was in the RSS. I don’t need much sleep, three hours is enough for me. My friends and my doctors complain that it is too less, but it is sufficient for me. You can see, I have worked all day but even now I am sitting here easily talking to you.
        
“I need my sleep. I need about eight hours a day, and about ten at night.”
Salvation (2005)
“876. One houre's sleepe before midnight is worth three after.”
Jacula Prudentum (1651)
                                        
                                        Starck answer to the question: "What’s the secret to working so quickly and productively?" 
Life’s Work: Philippe Starck (2013)
                                    
“I can sleep like a champion. I once slept through a smoke alarm going off. For three hours.”
Source: Let It Snow: Three Holiday Romances
“Men have three basic needs: Eating, sleeping, sex. That's it.”
Here's Your Sign Live! (2004)
Isabel Lucas talks ‘The Osiris Child’ and being no stranger to special effects. https://scifimonkeys.com/2017/11/14/isabel-lucas-talks-the-osiris-child-and-being-no-stranger-to-special-effects-interview/ (November 14, 2017)
“Three hours a day will produce as much as a man ought to write.”
Source: An Autobiography (1883), Ch. 15
                                        
                                        As quoted in The Wilson Era; Years of War and After, 1917–1923 (1946) by Josephus Daniels, p. 624. Referenced in  "Bartleby.com" http://www.bartleby.com/73/1288.html 
1920s and later
                                    
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        