Sentence:  By my feythe sayd syre launcelot in that pauelione wil I lodge alle this nyghte / and soo there he alyghte doune and tayed his hors to the pauelione / and there he vnarmed hym / and there he fond a bedde / and layd hym theryn / and felle on slepe <WSD>sadly</WSD> 
Meaning of the word marked with <WSD> tags:  Deeply, completely.