Yuvaraj pointed to a December 2002 in The Observer:
Creativity is mainly learnt. And while there is an element of nature involved, it predominantly comes down to nurture – a way of thinking that is picked up from parents or the people around you. Timely encouragement, of course plays, its part, along with finding an area of interest that really gets under your skin.
Creative people do, however, intuitively know the value of alternating the rhythms of work: when to let the mind wander, when to get down to hard work and when to put a problem on the back burner and leave the subconscious to mull it over. This is a crucial flexibility of mind demonstrated by the way creative people, even during periods of intense activity, manage to create little holes for themselves where they will instinctively take the mini breaks they need to let ideas come to them.
Time out feeds the quietness of mind that is essential to creativity.