A mosquito bit Robin and woke him from his sleep.
Unconsciously he slapped then scratched at the bite making the area even more swollen and red.
The thick netting to keep mosquitoes and other insects out that hung around the bed frame had not been drawn down.
That's how tired he must have been asleep last night that the thought did not occur to him.
Robin woke up to find that inside of the cabin the temperature had dropped considerably and he started shivering.
There was nothing he could do about the mosquito bite so he decided to use a blanket and wrap it around his body for warmth and protection from mosquitoes.
When he tried to pull on the blanket to cover himself properly he realized that it was caught under something heavy and massive.
Annoyed, Robin finally opened his eyes to see what was preventing him from using the blanket to his advantage and his eyes opened even wider when he saw the cause.