Seems like just sitting with one's feelings for 5 minutes a night would amortize the cost of those "blues" over the full length of the hike.

End of trip for non-amortized blues: OMG my sudden lack of trail-purpose is casting a 100 foot high shadow over my entire existence. Help!

End of trip for amortized blues: Ah this feels familiar, and a bit heavy. Gonna head home and read a book.

Edit: I'd bet the physical exhaustion from hiking would even aid in accessing said feelings. Synergy, baby!