How about a pillow case? You could stuff a jacket/sweater/other extra clothes in it to make pillow. Takes up little space and could help youu get some shut-eye.

A sleeping bag liner? They stuff down pretty small and could make sleeping more comfy, or give you the makings of a privacy sheet.

MRE heater or some other way to heat liquids if the power goes out?

Small LED lantern? The buiiding I used to work in got mighty dark at midnight when the lights really went off.

Small battery powered radio?

High fat snacks to help you fill up and stay warm at night?

Thermos of hot tea/coffee/chocolate on your desk throughout the day?