"Normal circumstances" refers to the usual, average or typical situation or conditions. It means things are happening in the way they usually do without any extraordinary or unusual circumstances. Full definition
The death benefit is determined at time of contract issue, and under normal circumstances does not change substantially during the lifetime of the policy. (lifeant.com)
Since we are not in normal circumstances, he does not feel or act tired, instead he becomes more energetic. (attachmentparenting.org)