We didn't start camping until we had all the kids, so it's not the same experience, but we used a portable dvd player in the tent. They were already so tired, they passed out quickly. Watching a movie made it less uncomfortable and strange to them being in a tent. However, I don't know if this would work with just one child. Maybe if it's their favorite movie, and you start watching it with them?
After the first year of camping we didn't have to use the dvd player anymore for bedtime.
1999 Land Cruiser ::::: ARB front - Warn M8000 - 3rd cup mod - Rear no-bumper? - 295/75/16 BFG AT - Cobra CB - OME lift w/ 863 rear coils - lots still to do!
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2000 4Runner: sold...and missed