Related to withdrawal and cravings, some people may experience changes in their sleep patterns. Many people experience insomnia or inability to sleep or stay asleep. Stimulant drugs such as amphetamines cause increased heart rate and alertness. While using these drugs it is hard to sleep until the effects wear off.
Even depressant substances like alcohol can affect sleep. Usually depressants or “downers” cause sleepiness, however, sleep is not usually peaceful. These substances may cause nightmares or interrupted sleep. In addition, sleep caused by CNS depressing drugs is generally lower quality than normal sleep.
Changes in weight
One of the noticeable signs of addiction that others notice is weight loss. Many drugs and substances that cause addiction can result in weight loss. Stimulant drugs like cocaine and amphetamines can cause dramatic weight loss. Oftentimes, these drug users are thin and gaunt.
Because addiction can make people spend money on substances rather than food or other needs, weight loss is a consequence. In addition, the stimulant drugs and nicotine have appetite suppressing properties which make users less hungry to begin with.
On the other hand, certain substances can increase weight gain. Notably alcohol and marijuana can cause unhealthy weight gain. Alcoholic drinks, particularly beer, are full of empty calories and carbs which eventually result in weight gain in many people. Marijuana contains cannabinoids that stimulate appetite, often referred to as “the munchies”. These cannabinoids have been studied for use in cancer patients and those with eating disorders like anorexia to promote appetite.