Sans has a bad case of the walking during slumber.

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Original Comic: https://absolutedream.deviantart.com/art/UnderTale-Comic-Sleep-Walking-Problem-584714493

(Cast)

[Sans] Corvo
https://www.youtube.com/channel/UC_pqfaUQOlg-shg1ge6PnGQ

[Papyrus] Branrich VanIstner

(Sound Effects)
Freesound.org

(Music)
Undertale OST by Toby Fox