Recommended Sleep Protection Products:
These are some of my tried and true Curly Girl Products:

Satin or Silk Bonnets
satihbonnet
satinbonnettoprotectcurlswhilesleeping 
Buffs
buffstosleepintoprotectcurls
buffstosleepintoprotectcurls
Satin Pony Tail Holder to Pineapple Hair
satinhairscrunchies
Satin or Silk Pillow Case
satinpillowcase
silkpillowcase

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