whAt is thE mAin iDEA oF thE pAssAgE
A．thErE is littlE DAngEr oF sErious AFtEr-EFFECts whEn humAn BEings ArE DEprivED oF slEEp For long pErioDs oF timE.
B．going without slEEp For A long pErioD will CAusE BAD shortlivEDE FFECts, But AppArEntly no sErious AFtEr-EFFECts.
C．AFtEr 200 hours without slEEp tripp wAs suFFEring From "mEntAl ill nEss".
D．thE DoCtors prEDiCtED tripp woulD slEEp For twEnty or thirty hours.