rearing when riding at night

I have a 4yo mare and I am riding her since January. Sometimes I do have to ride at night and for my surprise she gets sacared of something and she rears. Now I stopped to ride her at night. Riding at day light no problems. She just gets scared at night and sometimes rear. Any advice on how to deal with this problem.
Thanks.

Are you riding in a outdoor riding ring with lights?

I am riding with lights, indoor, with open walls. She seems to get scared with something she sees outside.

I had the same situation, my horse would spook at things he would hear out in the bush or something... Have you tried lunging her before you ride so she gets more comfortable?

No, I haven't lunge her and I think it is a good idea. Next time I have to ride at night I will try lunge. It should help. I believe that as she grows up this rearing thing will fade away. I hope so

If other horses are outside it is good to call them up so your horse can see it is another horse and know that they are there. If you have lights on outside that may help also

She might be night blind. My Appy is to an extent.
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As long as she's not having vision problems or something I'd treat it the same as I would during the day.

I ride at night often and expect them to act as good as day

Horse's don't have binocular vision and see things a bit out of focus. The lights and shadows play havoc with what the horse thinks it's seeing. If you were to ride down the road well away from the lights you'd have a much better ride. Horses are sure-footed in the dark.

Horses actually do have binocular vision AND monocular vision. It's just more monocular.