Answer:
subjective discomfort or personal distress and inability to function normally
Step-by-step explanation:
The result of not having the normal sleep is somehow severe in some cases.
In this case, the person involved did not sleep well the day that preceded the presentation and that was where he/she was finding it difficult to pick the right words at the right time.
This means he/she was personally distressed or feeling discomfort and this led to inability to function normally.