You rummage in your rucksack and find that cucumber sandwich you made for the journey.
It's gone a bit soggy though.
You make a mental note to skip the mayonnaise next time.
You strengthen your resolve and eat it anyway. You may need the energy later.
Bolstered by the invigourating feeling of the sandwich in your belly, your senses tingle in anticipation of continuing your adventure.
Or perhaps you decide to take a little nap
Also, what's that sounds coming from over the hill? Maybe you should check it out?