Hi Sally, I think you need to explain your question a bit more, in order to get some answers. What are you trying to achieve with the sleepers? What have you considered already, etc. In the pic it's not really possible to see the slope so it would help if you explain that too.
I'd always prefer them to be straight, using a spirit level. However your fence hasn't been put straight, do maybe you should just go with the slope of the ground?
Top of fence line will hopefully be broken in future years with planting. Sleeper line will always be more visible as at front of planting, so horizontal level sleepers to calm the senses and get some shrubs or trees planted!
Where there is a slope, then fencing and walling should be staggered, so the top of each fence panel or sleeper is straight. The fence should never be sloping. Like below.
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hedgehog99
Ellie
mii2
Sonia
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