This looked fun when Barb did it

Please entertain me by choosing a number and a character/pairing so I can find out what my headcanon actually is (I think there's quite a lot tucked away)...

1. sleep head canon
2. sad headcanon
3. happy headcanon
4. angry/violent headcanon
5. Sex headcanon
6. Bedroom/house/living quarters headcanon
7. romantic headcanon
8. family headcanon
9. friendship headcanon
10. quirks/hobbies headcanon
11. likes/dislikes headcanon
12. childhood headcanon
13. old age/aging headcanon
14. cooking/food headcanon
15. appearance headcanon
16. random headcanon
17. any other question of your choosing

(Answers probably in the comments because I'm not that organised!)