Answer:
In my opinion both the theories considers that an individual sleeps for survival.
Step-by-step explanation:
According to the adaptive sleep theory, sleep is important. On the other hand, the core-optional theory comprises two parts, that is, core sleep and optional sleep. Of these one part is essential, while the other is not. So, it can be concluded that both theories believe in the fact that one requires sleep in order to thrive or survive.