According to the Merriam-Webster dictionary,
HIBERNATION:
1 : to pass the winter in a torpid or resting state
2 : to be or become inactive or dormant
According to Rohene,
HIBERNATION:
Time when animals go dormant ‘cos of extreme cold and hot.
According to me,
HIBERNATION:
Time when Angel goes into deep sleep after extreme exhaustion or tortures such as two grueling exams in a day!