probably the most important thing to do is to not wear your hair in a tight ponytail or elastic band while you sleep. the tension on the hair may result in hair breakage during the night. also if you have a tendency to pull or twirl your hair while you sleep which you may not be aware of you may benefit from wearing a silk or cotton bonnet or cap similar to a shower cap. just be sure the elastic is not too tight around your forehead and hairline.
what can i do to protect my hair from getting damaged while i sleep?