Hey, I have 3b, 3c hair and I was wondering what's a good deep condition that you can sleep in?
I like to put jojoba extract in my hair at night and then rinse it out in the morning. Hair is so soft and well-conditioned!
I wouldn't suggest leaving in a deep conditioner over night because it could lead to over moisturization. What you can do is a hot oil treatment over night with an oil like olive, jojoba, or castor oil.
I have 3C hair and I have left in my hair for a long time - Shea Moisture's Raw Shea Butter Deep Treatment Mask. I LOVE this conditioner - it really does a great job.