I love oiling my hair and then washing with a stronger shampoo! It seems counter-intuitive (I always wondered why it wouldn't work the same if you just used a very mild low poo and didn't add any oil), but there's something about the combo that makes my hair super soft and happy, but clean, light, and refreshed.
BTW, I don't think I could ever get decent hair just "plopping" it on top of my pillow, like you described!

I will forever be envious of those who can go to bed with wet hair and wake up with great curls.