Thatcher: Can people get by on four hours' sleep?

Prof James Horne, also at Loughborough's sleep research centre, says that mood is critical. Soldiers high on adrenalin can function on little sleep: "It all depends if one gets a buzz out of what one's doing. If you're despondent, you tend to sleep more; if you're excited you need less. Margaret Thatcher was someone who felt on top of things."

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