Afternoon or evening fatigue can have various causes, ranging in severity from 'minor' to 'very serious'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose afternoon or evening fatigue, we could:
|Caffeine Intoxication||0%||Ruled out|
|Syndrome X||0%||Ruled out|
Do you regularly become tired in the afternoon or evening and feel like having a nap? Do not answer if the reason is lack of sleep or you work at night.
Possible responses:→ I don't sleep enough / I work nights / don't know
→ No / my energy level is generally fine
→ I feel like napping several times a month
→ I need a nap most days / fall asleep occasionally
→ I regularly fall asleep involuntarily
Caffeine is known to cause periods of exhaustion.