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18 years
Is it preferable to study and memorize till 12:00 midnight or to sleep 11:00 pm and wake up at 5:00 am to study ?
May 12, 2014

Dr. Salim Saab Otolaryngology (ENT)
it is preferable to sleep at 11 pm and wake at 5am because after11pm♠ there is less performance than before it
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