I’m the opposite I get vertigo on slopes in daylight but find when riding at night with a really bright light I just focus on my route and dont get the weird effect of the slopes around me. Feels almost like i have blinkers on which is ace for the vertigo type effect I get.
Did a night ride with a dimmer light the other day and I had a few moments of weird perpective. Its more pronounced if there is a slope away from me on the left, not so bad if its on my right. Annoying when what im riding is relatively straight forward but my head gets confused because of a nearby slope.
First time it happened I was about 7 or 8 and I was on a very steep hilside in wales, gave me a terrible fear of slopes and slipping . . I have battled it since then and I have promised myself that one day I will go skiing – not just yet though!