Well, he does sleep one hell of a lot in The Christmas Invasion. Also, I've heard of him sleeping in classic Who.
Besides, I'm not sure if he's actually sleeping in this fic. It's just Donna who thinks he's sleeping. When he disappears in the evening, it might just be that he wants to have a few quiet hours to himself to read or knit or do cross stitch or whatever Time Lords do for fun. Donna assumes he goes to bed, because that's what humans do. It's a POV thing.
I'm not sure where to take the fic, though. I've only got this image of panicky!Donna completely lost inside the TARDIS, lol ;).
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Besides, I'm not sure if he's actually sleeping in this fic. It's just Donna who thinks he's sleeping. When he disappears in the evening, it might just be that he wants to have a few quiet hours to himself to read or knit or do cross stitch or whatever Time Lords do for fun. Donna assumes he goes to bed, because that's what humans do. It's a POV thing.
I'm not sure where to take the fic, though. I've only got this image of panicky!Donna completely lost inside the TARDIS, lol ;).