Re: [b]Why do I need sleep?[/b] A good way to understand why you sleep is to look at what happens when we don't get enough: :arrow: As you know if you have ever pulled an all-nighter, missing one

[quote=jugitz]hmm..that's why i lose my concentration already..[/quote] yeah me too.. i was online in everyday soo i lose my concentrarion in study hhoo