What do you understand by sleep deficit Why does the amount of sleep required to rejuvenate people vary from - English -

Question

What do you understand by sleep deficit? Why does the amount of
sleep required to rejuvenate people vary from one person to
another

Nishtha Kapil · Accepted Answer

According to Dr Jeffrey Lipsitz, a Canadian expert on sleep
disorders, on an average, a healthy adult requires just over eight
hours of sleep at night Joseph De Koninck, a renowned professor of
psychology, is of the opinion that if one consistently gets less
sleep than one needs, then "a sleep deficit accumulates " The
amount of sleep required to rejuvenate people varies from one
person to another as there is no fixed number of hours for which
humans need to sleep

What do you understand by sleep deficit? Why does the amount of sleep required to rejuvenate people vary from one person to another