Even the stars need their beauty sleep, with world famous starlet Rihanna rumoured to have asked for a king size bed to be installed on the set of her latest music video, Where Have You Been. A source from the set of the video shoot told The Sun newspaper earlier this week: "She [Rihanna] doesn't cancel any work commitments so she has stipulated that a king-size bed be on photos so she can snooze between takes." Those of us with hectic lifestyles like Rihanna can find it hard to catch up on sleep. If your career is physically demanding it can mean a lower tolerance for tiredness, so those odd nights where you simply can't drop off can have more of an impact than they would on those working more "normal" jobs. If you find yourself in this position, take a leaf out of Rihanna's book and grab a kip whenever possible. Research into the benefits of napping is still on going, but if you literally don't have time for a good night's sleep, it's worthwhile grabbing what Zs you can!