1. Go outside at night or turn off all the lights in your home.
2. Allow 10 to 20 minutes for your eyes to adjust to the low light.
3. Look around.
4. Keep your eyes moving.
5. Experiment with different amounts of light to determine how well you can “see” in the dark.

via ehow

1. Practice in dim light.
2. Take Vitamin A.
3. When shifting from light to dark, close your eyes tight.
4. Wait for your eyes to adjust.
5. Look for basic shapes. 
6. Track movement.
7. Don’t try too hard.

via howtodothings

1. Take advantage of the structure of your eyes.
2. Keep your eyes adjusted for the dark.
3. Practice.
4. Scan, don't stare.
5. Protect your night vision.

via wikihow