I find it helps if I know where the summit is.
How true.
Many moons ago, a Snow Roads 300 permanent saw me climbing Cairn O Mount from the 'easier' North side on a very dark October night. After climbing for what seemed forever and saying over and over "this must be the top", I felt the road level off. Hurrah!
Far off in the distance and at an elevation much greater than the one I was presently riding, I could see a tiny pair of car headlights coming towards me. How bad did I feel then.
(The decent was a hoot, riding almost blind (using 2.5W of Halogen) down a steep, twisty and gravel-strewn piece of tarmac, not knowing if you were going to get ambushed by wildlife).