Final answer:
The information provided does not contain the answers to the specific questions about Jane Eyre.
Step-by-step explanation:
1. The concerns that kept Jane awake that night are not specified in the provided information.
2. The hushed sounds that forced Jane out of bed for a while are not specified in the provided information.
3. The information does not mention how Jane tried to compose her nerves.
4. The 'marrow-freezing incident' described by Jane is not provided in the information.