Use the following reading passage to answer the questions below.
How are Sleep Disorders Supported
The most common problem people have is falling asleep and staying asleep. For serious sleep disorders, a doctor may advise a prescription drug to be taken nightly.
Selective Gamma-aminobutyric acid medications: These prescription medications target the GABA receptors in the brain. GABA is the neurotransmitter that reduces alertness and promotes relaxation.
Unfortunately, this medication may cause side effects like hallucinations, memory disturbances, and “black-outs” wherein people report sleepwalking, sleep-eating, and even sleep-driving.
Benzodiazepines: Typically prescribed for anxiety, these prescription drugs activate the GABA receptors in the brain and cause sedation and relaxation. They can be considered extremely addictive with very difficult withdrawal symptoms, and can cause a similar “black-out” effect with users.
Antihistamines: These over-the-counter antihistamines are a common alternative for people who don’t want to take prescription drugs. The most common side effects of antihistamines are dryness, constipation, upset stomach, and feeling groggy the next day.
What is the meaning of the word withdrawal as used in this passage?