In the 1980s, the University of Chicago conducted a series of experiments on rats, and found that after 32 days of sleep deprivation all the rats had died.
ໃນຊຸມປີ 1980, ມະຫາວິທະຍາໄລຊິຄາໂກໄດ້ ດໍາ ເນີນການທົດລອງກ່ຽວກັບ ຫນູ, ແລະພົບວ່າຫລັງຈາກນອນຫລັບໄດ້ 32 ວັນ, ຫນູ ທັງ ຫມົດ ໄດ້ຕາຍ.