philosopher's hangover

The general malaise, fatigue, or otherwise hangover-like symptoms that are caused by discussing or debating a philosophical topic too late at night which resulted in you both (a) cognitively never resolving the issue and (b) losing an entire night's worth of sleep attempting to.

Issa, Ali, and Nick all woke up with a really bad philosopher's hangover after spending all night trying to solve the mind-body problem.