When work stops, the consequent plunge in endorphin production can literally cause unpleasant symptoms of withdrawal, not unlike the «Jonesing» sensation some experience after abusing heroin, prescription painkillers, or alcohol. (mindbodygreen.com)
In another study, passion flower was also found to be just as effective as the drug clonidine for treating symptoms of withdrawal. (detoxdiy.com)
When they wake up, says Dr. Hutchinson, «they're going to show symptoms of withdrawal: They'll be very grouchy, have a lot of muscle aches and feel bad.» (health.com)