Add a convenient bright-white USB LED to your kit. Works in either orientation, so you can't plug it in wrong in the dark of night.
Cleverly designed so it works either direction, you simply plug this 2-element white-LED USB light into any standard USB-A (flat rectangle) port, and you'll have a good amount of light to work with.
With it's lanyard/keychain hole, you'll have a source of light you can jack into any local USB port. Super convenient to have, especially with the surge in portable cellphone chargers. We even use an old phone charger with one of these units as a night-light!