How to prevent knots forming at night

My daughter, 3 yo, has gorgeous goldilock hair, I think 3b. It is always such a fight to get the knots out. I try 2 times a week to finger comb her hair in the tub with lots of conditioner, loreal no sulfer for curly hair. But her knots are mainly on the back of her head where she rubs her head while she sleeps. Is there anything I can do to eliminate those knots from forming? Like creams or a silk night cap?
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2C/3a, Medium Texture, Normal porosity, High Density, Normal Elasticity (so says the LCLF Hair analysis)
Co Wash: As I am
RO: Yes To Carrots / Ion
LI: Biotera / Samy Big Curls Defining Cream
Gel: FSG, Volumax (Original and Mega)
Color: Henna
Tools: Diffusing
:thumright:
CO-wash: Inecto coconut/ Elvive Volume Collagen
Treatments: Komaza Care Matani, coconut/ sweet almond/ fractionated coconut oils, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss Ultimate Volume, various Elvive
Styler: Umberto Giannini jelly, Au Naturale styling gelee
Flour sack towel, pixie diffuse or air dry.
Experimenting with: benign neglect