
Nicotine
If you habitually smoke or vape, the dopamine overload can keep you from sleeping. Dopamine prohibits melatonin, and nicotine is addictive due to dopamine release. Many people find it relaxing to smoke before bed, not knowing that nicotine will worsen their sleep. Anything with addictive or dopamine-inducing properties will ruin your amount and quality of sleep. You’ll also be significantly more sleepy during the daytime.
Tobacco users are more likely to develop sleep apnea. While you sleep, your brain may go through withdrawal symptoms, leaving you irritable when you awaken. Nicotine makes you stay up later, have a hard time falling asleep, wake up in the night, and your sleep isn’t as deep. Getting up in the morning is also much more difficult. Smoking is bad for your health, but if you’re a smoker, at least try to not smoke in your room or right before bed. You’ll feel significantly better when you sleep.