People who have habitually slept less than six hours a night and then begin sleeping eight or more hours a night typically begin to feel much less anxious.
Evidence
People who have habitually slept less than six hours a night and then begin sleeping eight or more hours a night typically begin to feel much less anxious.
Conclusion
Therefore, most people who sleep less than six hours a night can probably cause their anxiety levels to fall by beginning to sleep at least eight hours a night.
Evaluate
The argument asserts that one can likely produce a certain effect with a certain cause because that cause is typically followed by the effect.