Memories for life, what a spot!
Having drove past the packed KOA campground in Monument Vally, we arrived at Sleeping Bear with huge smiles on our faces... couldn't believe what a beautiful location it was and only one other van there!! OMG, desert camping at its best :-) only sad we only had one night there on our Utah road trip. A lovely young lady came to collect the $25? around 8pm, had a nice chat, she told us about the camps history and the formations surrounding us. We went on a horseback ride with Joe Atene, the entrance to which is very close to Sleeping Bear (see on Google maps). Note there are no signs on the main road to the campsite, just follow Google.
Would highly recommend to anyone staying in the area, provided you don't need any facilities, just peace and quiet. The road was in decent condition, our RV was 8m long and no issues at all with parking. some large parking spots are available.