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========== Tired? We all know the feeling; irritable, groggy and exceptionally lazy. Chances areyou didn't sleep enough last night, or the past few nights. But what exactly is "enough sleep?"And more importantly, can you ever "catch up" on it?While the very function of sleep is still debated by scientists, we do know that it'snecessary to function efficiently and productively. After all, we spend 24 years of our lifetimesleeping, it had better be important. Researchers have tested how much is required each nightby assigning groups of people to four, five, and eight hours of sleep over extended periods oftime. After 14 days, those with eight hours of sleep exhibited few attention lapses of cognitiveissues; however, those wi...