No Manual em Inglês da nova edição fica melhor explicado esta situação de dormir fora do acampamento.
Está assim nele:
"SPENDING THE NIGHT PHASE OUTSIDE OF CAMP: Some green Adventure cards and several Mystery cards force a character to spend the Night Phase outside of camp. In this case, you place all gained Mystery cards, Discovery tokens and resources gained during the Action which caused you to spend the night outside of the camp on your Character sheet instead of the Future Resources space. These materials and their effects (if any) until the end of the round are only available to you. Resources previously gathered by you in the round, if any, remain in the Future Resources space. If you resolve another Action in the same round and gain additional Treasures, Discovery tokens, or resources, place them in the Future Resources space as usual, unless another effect makes you spend the Night Phase outside of camp again. In this case, you can choose which of the tiles to spend the Night Phase on. During the Weather Phase, a character outside of camp is not affected by weather effects. Sleeping under an open sky (if there is no natural shelter on the respective Island tile) causes you to suffer 1 wound during the Night Phase. And, naturally, you must eat. If you have no food on your Character sheet, you suffer 2 wounds (see also the Night Phase on page 23). You return to camp at the start of the following round. All resources you still own are then placed in the Available Resources space."