Why do they dim the cabin lights for take-off and landing at night?

Just before take-off or before coming into land during the hours of darkness, the cabin crew will usually dim the lights in the cabin. The reason for this, is that in case of any problems that might involve an evacuation, your eyes will have pre-adjusted to the dark and allow you to see a lot better.

If you have to evacuate the plane and only the emergency lighting is available, having your eyes already adjusted to lower lighting conditions will assist you in the evacuation both inside the aircraft and also once you are outside. 

It’s a similar situation to trying to find your way back to bed after having the light on in the bathroom at night – except with a little more drama. 

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