Mmm, it seems to be a problem here and everywhere.

[He remembered when Shinpachi had insomnia and troubles staying asleep even when he did manage to get past his exhaustion. There's a long pause as Souji thinks, not wanting to turn off the microphone yet.]

I've heard sleeping in several short to long naps throughout the day can help ease the exhaustion. [Never mind that it's what he did even before the nightmares and the draft.] Otherwise, it could help talking to someone about it.