Seems like it should be sort of self-correcting over time if you are out more than 1-2 nights and covering any kind of mileage. If you didn't get sleep the 1st night, despite the extra exercise and outdoors, the second night after another dose of exercise plus lack of sleep should pretty well do you in.

Also, perhaps more of a "comfort food" supper and hot chocolate just before going to bed.

Or, if you are awake, how about reading for a while?

I know it used to be for me that all the stealthy little creepings and snappings out in the woods kept me in alert mode. I've gotten over that now, but if that bothers you, the earplug suggestion may be helpful.